Standard Atomic Weights

en · official · sha256:5a47909f94599750b9bceb23dc5e71232829b4bd76947ae954a39d77ea622a86

<tr><td>1</td><td>H</td><td><a href="hydrogen.htm">hydrogen</a></td><td>&nbsp;&nbsp;[1.007&nbsp;84,&nbsp;1.008&nbsp;11]</td><td><a href="#m">m</a></td></tr>

Referencing norms: el-1, name-1, note-1-m, saw-1, sym-1, z-1

en · official · sha256:b742b55d216fe783a34fb7252d55677d0746fd3349d2837d1b8cd27ec1d3254a

<tr><td>10</td><td>Ne</td><td><a href="neon.htm">neon</a></td><td>&nbsp;&nbsp;20.1797(6)</td><td><a href="#g">g</a> <a href="#m">m</a></td></tr>

Referencing norms: el-10, name-10, note-10-g, note-10-m, saw-10, sym-10, z-10

en · official · sha256:b28bbdb34e2d0b9e94d5634dc1fd2d3e225a369279c8a0b39f2974feadb09b9d

<tr><td>100</td><td>Fm</td><td>fermium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-100, name-100, saw-100, sym-100, z-100

en · official · sha256:b95895d363c70764d41eb29e625e690e868a194c1b0e41207c7032f48e438c45

<tr><td>101</td><td>Md</td><td>mendelevium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-101, name-101, saw-101, sym-101, z-101

en · official · sha256:3326c67b9a2b02fe4dc4991dc84c85cde2adb406f480604244f1e88406d66edd

<tr><td>102</td><td>No</td><td>nobelium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-102, name-102, saw-102, sym-102, z-102

en · official · sha256:0781bc40f9dfa8ced0baa70a45efa54b5ed2eab9e432972f2a6cc4954d710e22

<tr><td>103</td><td>Lr</td><td>lawrencium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-103, name-103, saw-103, sym-103, z-103

en · official · sha256:4b4b841a003ae7856ae0e4857b0794cca049527e560da46546a2a616d0ebeecc

<tr><td>104</td><td>Rf</td><td>rutherfordium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-104, name-104, saw-104, sym-104, z-104

en · official · sha256:271045c6fdf9638c0dec1f26df653dc900f499ca5cb9b11fc75c34f3fd1ec7c4

<tr><td>105</td><td>Db</td><td>dubnium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-105, name-105, saw-105, sym-105, z-105

en · official · sha256:e9bda02c0b25166e55e7fd400838d2e2f7d1f7c9327000c413dcee11a6c5377f

<tr><td>106</td><td>Sg</td><td>seaborgium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-106, name-106, saw-106, sym-106, z-106

en · official · sha256:76fd0393fc98b309b8a75fc3307a271ee889b45fc21972fab9c7f84f121b57c3

<tr><td>107</td><td>Bh</td><td>bohrium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-107, name-107, saw-107, sym-107, z-107

en · official · sha256:7db897b76e7683d692cee7f4e41a6d25311e2a29121b270361efc05c6e99dde2

<tr><td>108</td><td>Hs</td><td>hassium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-108, name-108, saw-108, sym-108, z-108

en · official · sha256:616f9575a11fbfe1068c90b2decab039f56c1d3e97b2b7e2d4e5afc7b92259d6

<tr><td>109</td><td>Mt</td><td>meitnerium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-109, name-109, saw-109, sym-109, z-109

en · official · sha256:c73a2857ae223c3bd7033b0cf6cd40b3e919155016c45b40231c8b68c087fc5e

<tr><td>11</td><td>Na</td><td><a href="sodium.htm">sodium</a></td><td>&nbsp;&nbsp;22.989&nbsp;769&nbsp;28(2)</td><td></td></tr>

Referencing norms: el-11, name-11, saw-11, sym-11, z-11

en · official · sha256:509dc4e2a269791b51ce5f828768b1cf80068f5c010aac5e8adba56311ee0e64

<tr><td>110</td><td>Ds</td><td>darmstadtium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-110, name-110, saw-110, sym-110, z-110

en · official · sha256:e58e8c8da8d5212c163953ffc4249b1afd2c02981ca5cf8fe8dad50fd90b9192

<tr><td>111</td><td>Rg</td><td>roentgenium </td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-111, name-111, saw-111, sym-111, z-111

en · official · sha256:f94b831e5a271696e977f5e6bbd82edd9e6d0f33d655416f97dcbb659202c031

<tr><td>112</td><td>Cn</td><td>copernicium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-112, name-112, saw-112, sym-112, z-112

en · official · sha256:831371ef6a7050976757a23e0a3c0c2501023f7265c5039eb0fe1bfd8652aaa9

<tr><td>113</td><td>Nh</td><td>nihonium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-113, name-113, saw-113, sym-113, z-113

en · official · sha256:22dc360fd6545f758c92e5c5f450f1a0a1f4fac56d61c57f9c191a1437449466

<tr><td>114</td><td>Fl</td><td>flerovium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-114, name-114, saw-114, sym-114, z-114

en · official · sha256:f6890090ad0bbe418113f00e1ce8639fd0e2b5318776433e734e751bb046686d

<tr><td>115</td><td>Mc</td><td>moscovium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-115, name-115, saw-115, sym-115, z-115

en · official · sha256:2d78303941d0cca65d337b3d2be346cd6d52d7eaeafc7af4f3b50e4bc680fb8e

<tr><td>116</td><td>Lv</td><td>livermorium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-116, name-116, saw-116, sym-116, z-116

en · official · sha256:8d6450361f75986e8dd68340ef40fe630ec5aff9b4c3274a7787078d1c448587

<tr><td>117</td><td>Ts</td><td>tennessine</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-117, name-117, saw-117, sym-117, z-117

en · official · sha256:4e1251d5c4218e848e5b486868ed75e7875a376a6e536d9c814a0ef80944bac8

<tr><td>118</td><td>Og</td><td>oganesson</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-118, name-118, saw-118, sym-118, z-118

en · official · sha256:0dfe3704c2ae08259e9a82a495ac0ebc403fca401cf53cceb33b7a87e53b0a02

<tr><td>12</td><td>Mg</td><td><a href="magnesium.htm">magnesium</a></td><td>&nbsp;[24.304,&nbsp;24.307]</td><td></td></tr>

Referencing norms: el-12, name-12, saw-12, sym-12, z-12

en · official · sha256:ea45e41dace9c23e5edf6dd69dd88c2dd6c304723cf29002643917d59d9bac71

<tr><td>13</td><td>Al</td><td><a href="aluminium.htm">aluminium</a></td><td>&nbsp;&nbsp;26.981&nbsp;5384(3)</td><td></td></tr>

Referencing norms: el-13, name-13, saw-13, sym-13, z-13

en · official · sha256:23ad25726d20ef6fabd489a2581b7bd7856d1a3c1730b901bdbdc8332155dd5c

<tr><td>14</td><td>Si</td><td><a href="silicon.htm">silicon</a></td><td>&nbsp;[28.084,&nbsp;28.086]</td><td></td></tr>

Referencing norms: el-14, name-14, saw-14, sym-14, z-14

en · official · sha256:b7d32238bb0d79e5be2125f9a58bb07b12451454234939afdda57016f87ea9b0

<tr><td>15</td><td>P</td><td><a href="phosphorus.htm">phosphorus</a></td><td>&nbsp;&nbsp;30.973&nbsp;761&nbsp;998(5)</td><td></td></tr>

Referencing norms: el-15, name-15, saw-15, sym-15, z-15

en · official · sha256:9731efd74afc1796871d7daa44684865f0a3f5c2abc26d39e4db03ef4d339ee9

<tr><td>16</td><td>S</td><td><a href="sulfur.htm">sulfur</a></td><td>&nbsp;[32.059,&nbsp;32.076]</td><td></td></tr>

Referencing norms: el-16, name-16, saw-16, sym-16, z-16

en · official · sha256:b14f89f46216b870d25eb0343aef95bc3842cc352f12e38e370efde988f0d504

<tr><td>17</td><td>Cl</td><td><a href="chlorine.htm">chlorine</a></td><td>&nbsp;[35.446,&nbsp;35.457]</td><td><a href="#m">m</a></td></tr>

Referencing norms: el-17, name-17, note-17-m, saw-17, sym-17, z-17

en · official · sha256:1aadfb75fc234f7381090a29c4c720d47a9cd4ef3b4621ddeba13e3bfccd7605

<tr><td>18</td><td>Ar</td><td><a href="argon.htm">argon</a></td><td>&nbsp;[39.792,&nbsp;39.963]</td><td></td></tr>

Referencing norms: el-18, name-18, saw-18, sym-18, z-18

en · official · sha256:218db81cb2eea17cabec4317309436ba4559f61d3efbb4cfdc32581d820c1526

<tr><td>19</td><td>K</td><td><a href="potassium.htm">potassium</a></td><td>&nbsp;&nbsp;39.0983(1)</td><td></td></tr>

Referencing norms: el-19, name-19, saw-19, sym-19, z-19

en · official · sha256:d841828fb62171adbf8dd3dd5326efd60eaff786830a370051b801979a6c2d13

<tr><td>2</td><td>He</td><td><a href="helium.htm">helium</a></td><td>&nbsp;&nbsp;&nbsp;4.002&nbsp;602(2)</td><td><a href="#g">g</a> <a href="#r">r</a></td></tr>

Referencing norms: el-2, name-2, note-2-g, note-2-r, saw-2, sym-2, z-2

en · official · sha256:ae26ab3240843a11c621dd5e19ee5b115eee6e89664c7999e2383e9d6e9a9526

<tr><td>20</td><td>Ca</td><td><a href="calcium.htm">calcium</a></td><td>&nbsp;&nbsp;40.078(4)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-20, name-20, note-20-g, saw-20, sym-20, z-20

en · official · sha256:e19088d2e0656f0357ba7eb3f31c9a8b1b963f9fdbbcce45f12b0e25cfdefa5f

<tr><td>21</td><td>Sc</td><td><a href="scandium.htm">scandium</a></td><td>&nbsp;&nbsp;44.955&nbsp;907(4)</td><td></td></tr>

Referencing norms: el-21, name-21, saw-21, sym-21, z-21

en · official · sha256:2ec73346ceea9d185b5fe9ef82e335ff10ec511c11eb8ea3950b84ecd46aa430

<tr><td>22</td><td>Ti</td><td><a href="titanium.htm">titanium</a></td><td>&nbsp;&nbsp;47.867(1)</td><td></td></tr>

Referencing norms: el-22, name-22, saw-22, sym-22, z-22

en · official · sha256:908cfe47aab2689f1c733edf4ef57201497c365ae48cbf430ea7b7c4d733fc91

<tr><td>23</td><td>V</td><td><a href="vanadium.htm">vanadium</a></td><td>&nbsp;&nbsp;50.9415(1)</td><td></td></tr>

Referencing norms: el-23, name-23, saw-23, sym-23, z-23

en · official · sha256:44ca311687b0bca24c4040d72d2b7abed00b08adfe5d7493b15f7fcf7fcc4fcb

<tr><td>24</td><td>Cr</td><td><a href="chromium.htm">chromium</a></td><td>&nbsp;&nbsp;51.9961(6)</td><td></td></tr>

Referencing norms: el-24, name-24, saw-24, sym-24, z-24

en · official · sha256:e7b5123a4de33d8bfe2360f7a50e9a289900ac4cc39881fca8721b5c67962dce

<tr><td>25</td><td>Mn</td><td><a href="manganese.htm">manganese</a></td><td>&nbsp;&nbsp;54.938&nbsp;043(2)</td><td></td></tr>

Referencing norms: el-25, name-25, saw-25, sym-25, z-25

en · official · sha256:80c5ca9f8b3b2b90a8bcd05beddd66950727e4fcf311844cd6a3eb09d2efb92c

<tr><td>26</td><td>Fe</td><td><a href="iron.htm">iron</a></td><td>&nbsp;&nbsp;55.845(2)</td><td></td></tr>

Referencing norms: el-26, name-26, saw-26, sym-26, z-26

en · official · sha256:464983292b3c352170aa8fb44210b9717b73f153abb8db800c173dcacd3453f4

<tr><td>27</td><td>Co</td><td><a href="cobalt.htm">cobalt</a></td><td>&nbsp;&nbsp;58.933 194(3)</td><td></td></tr>

Referencing norms: el-27, name-27, saw-27, sym-27, z-27

en · official · sha256:24d64921cda86de174107773c90b9d490c331bac209b0460def0bc45db32ddb9

<tr><td>28</td><td>Ni</td><td><a href="nickel.htm">nickel</a></td><td>&nbsp;&nbsp;58.6934(4)</td><td><a href="#r">r</a></td></tr>

Referencing norms: el-28, name-28, note-28-r, saw-28, sym-28, z-28

en · official · sha256:a9fc497fe6a0be824cea24a092f19439543208c4f52e90bef3ca020a2f8a8471

<tr><td>29</td><td>Cu</td><td><a href="copper.htm">copper</a></td><td>&nbsp;&nbsp;63.546(3)</td><td><a href="#r">r</a></td></tr>

Referencing norms: el-29, name-29, note-29-r, saw-29, sym-29, z-29

en · official · sha256:387e0d62772329ed0aa072058b092c27bd338a6c23f7494522f35f7a77ab2253

<tr><td>3</td><td>Li</td><td><a href="lithium.htm">lithium</a></td><td>&nbsp;&nbsp;[6.938,&nbsp;6.997]</td><td><a href="#m">m</a></td></tr>

Referencing norms: el-3, name-3, note-3-m, saw-3, sym-3, z-3

en · official · sha256:d90683fedacce154e0f10eecd9847589e5320c05e3d0495788770068365ed046

<tr><td>30</td><td>Zn</td><td><a href="zinc.htm">zinc</a></td><td>&nbsp;&nbsp;65.38(2)</td><td><a href="#r">r</a></td></tr>

Referencing norms: el-30, name-30, note-30-r, saw-30, sym-30, z-30

en · official · sha256:b059326554bc0b105e46151fde816183999cbe8af32b18b396336970ddf1e2a2

<tr><td>31</td><td>Ga</td><td><a href="gallium.htm">gallium</a></td><td>&nbsp;&nbsp;69.723(1)</td><td></td></tr>

Referencing norms: el-31, name-31, saw-31, sym-31, z-31

en · official · sha256:cf615ca9b63852692ec0365944a1798358b841a5f3353d0985b167555273ce49

<tr><td>32</td><td>Ge</td><td><a href="germanium.htm">germanium</a></td><td>&nbsp;&nbsp;72.630(8)</td><td></td></tr>

Referencing norms: el-32, name-32, saw-32, sym-32, z-32

en · official · sha256:f04131c3b42cabab32821f3733b681bc159231d2956152df87f3782ef52ab4ba

<tr><td>33</td><td>As</td><td><a href="arsenic.htm">arsenic</a></td><td>&nbsp;&nbsp;74.921&nbsp;595(6)</td><td></td></tr>

Referencing norms: el-33, name-33, saw-33, sym-33, z-33

en · official · sha256:f02082d6534dee47fa3d194f0c6c8804fd818b02500da91c464c938749194895

<tr><td>34</td><td>Se</td><td><a href="selenium.htm">selenium</a></td><td>&nbsp;&nbsp;78.971(8)</td><td><a href="#r">r</a></td></tr>

Referencing norms: el-34, name-34, note-34-r, saw-34, sym-34, z-34

en · official · sha256:6aa317be49377535b16b5a1e23a698e50f3c9f615efebb6370a4ba33521dba54

<tr><td>35</td><td>Br</td><td><a href="bromine.htm">bromine</a></td><td>&nbsp;[79.901,&nbsp;79.907]</td><td></td></tr>

Referencing norms: el-35, name-35, saw-35, sym-35, z-35

en · official · sha256:73a3fe39f30f8c5b0254e3fe43085c855107195984e6edfc0966a74ccd2bb120

<tr><td>36</td><td>Kr</td><td><a href="krypton.htm">krypton</a></td><td>&nbsp;&nbsp;83.798(2)</td><td><a href="#g">g</a> <a href="#m">m</a></td></tr>

Referencing norms: el-36, name-36, note-36-g, note-36-m, saw-36, sym-36, z-36

en · official · sha256:2e95de5f118da99f59e937816ab6121928909d877a9f1b8ffb76996c4c6ed54a

<tr><td>37</td><td>Rb</td><td><a href="rubidium.htm">rubidium</a></td><td>&nbsp;&nbsp;85.4678(3)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-37, name-37, note-37-g, saw-37, sym-37, z-37

en · official · sha256:3c8f1c238c7ff3da74b173fc9c6489df3ad27179e61f10a35a3f8b1596d2427b

<tr><td>38</td><td>Sr</td><td><a href="strontium.htm">strontium</a></td><td>&nbsp;&nbsp;87.62(1)</td><td><a href="#g">g</a> <a href="#r">r</a></td></tr>

Referencing norms: el-38, name-38, note-38-g, note-38-r, saw-38, sym-38, z-38

en · official · sha256:9aff91ad7f8e5a34caf848ba28b145739ee7770d8e62c4bfffd320601e0d0f54

<tr><td>39</td><td>Y</td><td><a href="yttrium.htm">yttrium</a></td><td>&nbsp;&nbsp;88.905&nbsp;838(2)</td><td></td></tr>

Referencing norms: el-39, name-39, saw-39, sym-39, z-39

en · official · sha256:c6fc78aff071d967d9c835aaa13391e0b39750bff6ac03df7f5f78d757066465

<tr><td>4</td><td>Be</td><td><a href="beryllium.htm">beryllium</a></td><td>&nbsp;&nbsp;&nbsp;9.012&nbsp;1831(5)</td><td></td></tr>

Referencing norms: el-4, name-4, saw-4, sym-4, z-4

en · official · sha256:098785db6e179fcadf895fc328bd83bedd153957a205d569e227fe7ccb16e043

<tr><td>40</td><td>Zr</td><td><a href="zirconium.htm">zirconium</a></td><td>&nbsp;&nbsp;91.222(3)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-40, name-40, note-40-g, saw-40, sym-40, z-40

en · official · sha256:ab6e6fd769a7026fa7c4d56af848bd946564a11969c527467224dea64ee1ce2e

<tr><td>41</td><td>Nb</td><td><a href="niobium.htm">niobium</a></td><td>&nbsp;&nbsp;92.906&nbsp;37(1)</td><td></td></tr>

Referencing norms: el-41, name-41, saw-41, sym-41, z-41

en · official · sha256:5d444ed004aad7471c8c451be090a2edd00260b94e464c59b3648f2df121e125

<tr><td>42</td><td>Mo</td><td><a href="molybdenum.htm">molybdenum</a></td><td>&nbsp;&nbsp;95.95(1)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-42, name-42, note-42-g, saw-42, sym-42, z-42

en · official · sha256:21887a0dfa68e4dd2303131836bca7f03f7cca33d493b6f1022fba265083a9fd

<tr><td>43</td><td>Tc</td><td>technetium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-43, name-43, saw-43, sym-43, z-43

en · official · sha256:e4df40abfc60b05d771ada7b8a7491565ade9312295f1051b5843db2c755c627

<tr><td>44</td><td>Ru</td><td><a href="ruthenium.htm">ruthenium</a></td><td>&nbsp;101.07(2)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-44, name-44, note-44-g, saw-44, sym-44, z-44

en · official · sha256:fdf6841b447347ae564fdf42541229665bc6d83b7e10d20cc601076a2073db19

<tr><td>45</td><td>Rh</td><td><a href="rhodium.htm">rhodium</a></td><td>&nbsp;102.905&nbsp;49(2)</td><td></td></tr>

Referencing norms: el-45, name-45, saw-45, sym-45, z-45

en · official · sha256:1c9b5910934fdad488d2d98947c7b16b607483161567e8dd745440a1542cd953

<tr><td>46</td><td>Pd</td><td><a href="palladium.htm">palladium</a></td><td>&nbsp;106.42(1)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-46, name-46, note-46-g, saw-46, sym-46, z-46

en · official · sha256:7620a25913e50834948b5959dfc2798f2b0ac89028c46c2f30a1637f38506826

<tr><td>47</td><td>Ag</td><td><a href="silver.htm">silver</a></td><td>&nbsp;107.8682(2)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-47, name-47, note-47-g, saw-47, sym-47, z-47

en · official · sha256:08cae75bacab7b203c24f3519bf743f342afb0690b436cf65d088aed768c05d7

<tr><td>48</td><td>Cd</td><td><a href="cadmium.htm">cadmium</a></td><td>&nbsp;112.414(4)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-48, name-48, note-48-g, saw-48, sym-48, z-48

en · official · sha256:086e2c193eefee39985540b3f8d1097d631e8229471aa67639d6fd6053abc35d

<tr><td>49</td><td>In</td><td><a href="indium.htm">indium</a></td><td>&nbsp;114.818(1)</td><td></td></tr>

Referencing norms: el-49, name-49, saw-49, sym-49, z-49

en · official · sha256:da02af9171012c6676ee85197e4fa20fa395f773d44b57a5cd827f9b50319415

<tr><td>5</td><td>B</td><td><a href="boron.htm">boron</a></td><td>&nbsp;[10.806,&nbsp;10.821]</td><td><a href="#m">m</a></td></tr>

Referencing norms: el-5, name-5, note-5-m, saw-5, sym-5, z-5

en · official · sha256:b8f73b47547d283040b7130acb0ab2608d502641d192321160683fb9de93e8d3

<tr><td>50</td><td>Sn</td><td><a href="tin.htm">tin</a></td><td>&nbsp;118.710(7)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-50, name-50, note-50-g, saw-50, sym-50, z-50

en · official · sha256:883070fbfe24817b6462d676ba63fd4dcb5a73e2ce0e3fd13d437201efd19172

<tr><td>51</td><td>Sb</td><td><a href="antimony.htm">antimony</a></td><td>&nbsp;121.760(1)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-51, name-51, note-51-g, saw-51, sym-51, z-51

en · official · sha256:d273f3c91a2e70f093189e5094480d9465f09afb4570d0e9d82583bd05074798

<tr><td>52</td><td>Te</td><td><a href="tellurium.htm">tellurium</a></td><td>&nbsp;127.60(3)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-52, name-52, note-52-g, saw-52, sym-52, z-52

en · official · sha256:8b2f668fdbb7bf50b637499bdada76fc242b47d1ba16785a3d32be29c09811c3

<tr><td>53</td><td>I</td><td><a href="iodine.htm">iodine</a></td><td>&nbsp;126.904&nbsp;47(3)</td><td></td></tr>

Referencing norms: el-53, name-53, saw-53, sym-53, z-53

en · official · sha256:31fdcd72e19503cc962b7aef327bc261c00e0840f0a3167d450c833a745e51de

<tr><td>54</td><td>Xe</td><td><a href="xenon.htm">xenon</a></td><td>&nbsp;131.293(6)</td><td><a href="#g">g</a> <a href="#m">m</a></td></tr>

Referencing norms: el-54, name-54, note-54-g, note-54-m, saw-54, sym-54, z-54

en · official · sha256:6eb1155a43c6d548bc22fd6f16545ee8b62de54a1b44cac49ebcdcb47bcf7c68

<tr><td>55</td><td>Cs</td><td><a href="caesium.htm">caesium</a></td><td>&nbsp;132.905&nbsp;451&nbsp;96(6)</td><td></td></tr>

Referencing norms: el-55, name-55, saw-55, sym-55, z-55

en · official · sha256:5189867c358f2dd965af63ea2df8ae754388102d4d18fc8f01e60d20ad376350

<tr><td>56</td><td>Ba</td><td><a href="barium.htm">barium</a></td><td>&nbsp;137.327(7)</td><td></td></tr>

Referencing norms: el-56, name-56, saw-56, sym-56, z-56

en · official · sha256:d25acb9ff0a87afb5308619709321c7c8763cb230bca1166cf20ef6bd789afe3

<tr><td>57</td><td>La</td><td><a href="lanthanum.htm">lanthanum</a></td><td>&nbsp;138.905&nbsp;47(7)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-57, name-57, note-57-g, saw-57, sym-57, z-57

en · official · sha256:8b19730007769f6c13f5bb8f8f6bdfa66cf3c74dcc42adb24a2df7c0dec648f7

<tr><td>58</td><td>Ce</td><td><a href="cerium.htm">cerium</a></td><td>&nbsp;140.116(1)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-58, name-58, note-58-g, saw-58, sym-58, z-58

en · official · sha256:fc73caa1f874d1de7e6ba80125c1475370736318eba5b7282254f698b482083f

<tr><td>59</td><td>Pr</td><td><a href="praseodymium.htm">praseodymium</a></td><td>&nbsp;140.907&nbsp;66(1)</td><td></td></tr>

Referencing norms: el-59, name-59, saw-59, sym-59, z-59

en · official · sha256:60ca1f7112e89fe67339db681b75aa12972bf380f2e14ba045fb99d0a7efda50

<tr><td>6</td><td>C</td><td><a href="carbon.htm">carbon</a></td><td>&nbsp;[12.0096,&nbsp;12.0116]</td><td></td></tr>

Referencing norms: el-6, name-6, saw-6, sym-6, z-6

en · official · sha256:c4da4ef68c0b84661dd9960a2ef686e15d8c7e14e424de4b8753f18078b6ad56

<tr><td>60</td><td>Nd</td><td><a href="neodymium.htm">neodymium</a></td><td>&nbsp;144.242(3)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-60, name-60, note-60-g, saw-60, sym-60, z-60

en · official · sha256:a577b4c2515ef4c5e4963c0c4e882f1dd3b1d2e3a2ae3eddbb32061603dd1dbe

<tr><td>61</td><td>Pm</td><td>promethium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-61, name-61, saw-61, sym-61, z-61

en · official · sha256:a0f2112f13b3619ffc4b2bee3d0cfaec26d931b937d5a73f4d3abb0ec7dca241

<tr><td>62</td><td>Sm</td><td><a href="samarium.htm">samarium</a></td><td>&nbsp;150.36(2)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-62, name-62, note-62-g, saw-62, sym-62, z-62

en · official · sha256:b74e02ba4518c334ab2c73d0f868860635f940ed009689a844e943f95c818002

<tr><td>63</td><td>Eu</td><td><a href="europium.htm">europium</a></td><td>&nbsp;151.964(1)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-63, name-63, note-63-g, saw-63, sym-63, z-63

en · official · sha256:859d323fb86d163f1d2b62e6ee699d6bb49740d2d3e9a42112a7c0b124094c9d

<tr><td>64</td><td>Gd</td><td><a href="gadolinium.htm">gadolinium</a></td><td>&nbsp;157.249(2)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-64, name-64, note-64-g, saw-64, sym-64, z-64

en · official · sha256:255317c323a334da2106c9cce9e763f05ed276734f7d5512ccfceda09cc0ba13

<tr><td>65</td><td>Tb</td><td><a href="terbium.htm">terbium</a></td><td>&nbsp;158.925&nbsp;354(7)</td><td></td></tr>

Referencing norms: el-65, name-65, saw-65, sym-65, z-65

en · official · sha256:73ec6fadaa075cfd790fed7f664700dca419b8582b3e6a0c18cf8267cb510c8b

<tr><td>66</td><td>Dy</td><td><a href="dysprosium.htm">dysprosium</a></td><td>&nbsp;162.500(1)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-66, name-66, note-66-g, saw-66, sym-66, z-66

en · official · sha256:6bca5c180f5cd18e8edd8f0dcd7bfbd40222fd33011268d06d636229987e8685

<tr><td>67</td><td>Ho</td><td><a href="holmium.htm">holmium</a></td><td>&nbsp;164.930&nbsp;329(5)</td><td></td></tr>

Referencing norms: el-67, name-67, saw-67, sym-67, z-67

en · official · sha256:f1d165e5620ba165eae28ea8b489fcd88321b05e85a4492e7a158a3632d6d63c

<tr><td>68</td><td>Er</td><td><a href="erbium.htm">erbium</a></td><td>&nbsp;167.259(3)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-68, name-68, note-68-g, saw-68, sym-68, z-68

en · official · sha256:1c5aca471a75050004c785f6210ea038f83d05d681c32996478241a7bc94b618

<tr><td>69</td><td>Tm</td><td><a href="thulium.htm">thulium</a></td><td>&nbsp;168.934&nbsp;219(5)</td><td></td></tr>

Referencing norms: el-69, name-69, saw-69, sym-69, z-69

en · official · sha256:617c331cc6bfaa83978b48216d7f27e278ce5b38491cb4fc27d19b0e6dab3c83

<tr><td>7</td><td>N</td><td><a href="nitrogen.htm">nitrogen</a></td><td>&nbsp;[14.006&nbsp;43,&nbsp;14.007&nbsp;28]</td><td><a href="#m">m</a></td></tr>

Referencing norms: el-7, name-7, note-7-m, saw-7, sym-7, z-7

en · official · sha256:dbadb24594f15af930d63c2d1529f4efc3324575a7074301904e8a93822be469

<tr><td>70</td><td>Yb</td><td><a href="ytterbium.htm">ytterbium</a></td><td>&nbsp;173.045(10)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-70, name-70, note-70-g, saw-70, sym-70, z-70

en · official · sha256:f529ebeaeb8dadb8abe49a5c614f44020dafed747a19484e3da6c95324d4214a

<tr><td>71</td><td>Lu</td><td><a href="lutetium.htm">lutetium</a></td><td>&nbsp;174.966&nbsp;69(5)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-71, name-71, note-71-g, saw-71, sym-71, z-71

en · official · sha256:c59e56c17dd08e31f7548f292577d95d1991eab2ed28ae5b006be5204fa1910b

<tr><td>72</td><td>Hf</td><td><a href="hafnium.htm">hafnium</a></td><td>&nbsp;178.486(6)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-72, name-72, note-72-g, saw-72, sym-72, z-72

en · official · sha256:6ed08a40391224c73fa97cce6b7bc92af46cbf14cad7d25a24158dba9685c488

<tr><td>73</td><td>Ta</td><td><a href="tantalum.htm">tantalum</a></td><td>&nbsp;180.947&nbsp;88(2)</td><td></td></tr>

Referencing norms: el-73, name-73, saw-73, sym-73, z-73

en · official · sha256:e0ff8fa242a77f436d67782416c4f9c66b22e4f24d35c12ffe5767ba7ee9b32e

<tr><td>74</td><td>W</td><td><a href="tungsten.htm">tungsten</a></td><td>&nbsp;183.84(1)</td><td></td></tr>

Referencing norms: el-74, name-74, saw-74, sym-74, z-74

en · official · sha256:c350e3c9b19045916143c1d3a9aca6cf9fd117f33a2461bfc2febc3533fd8489

<tr><td>75</td><td>Re</td><td><a href="rhenium.htm">rhenium</a></td><td>&nbsp;186.207(1)</td><td></td></tr>

Referencing norms: el-75, name-75, saw-75, sym-75, z-75

en · official · sha256:c62474830bf55e316e60a1ebf06c3b588ee38833968fa50c2b8ccdf4bafe1964

<tr><td>76</td><td>Os</td><td><a href="osmium.htm">osmium</a></td><td>&nbsp;190.23(3)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-76, name-76, note-76-g, saw-76, sym-76, z-76

en · official · sha256:99607265d747f344d6166de2813d42844e92bb2098c475132889817e7c5eec45

<tr><td>77</td><td>Ir</td><td><a href="iridium.htm">iridium</a></td><td>&nbsp;192.217(2)</td><td></td></tr>

Referencing norms: el-77, name-77, saw-77, sym-77, z-77

en · official · sha256:b8961f95554c7f2fe60961921328a62dbed772630d6043e912da6d3afd0c9d71

<tr><td>78</td><td>Pt</td><td><a href="platinum.htm">platinum</a></td><td>&nbsp;195.084(9)</td><td></td></tr>

Referencing norms: el-78, name-78, saw-78, sym-78, z-78

en · official · sha256:e98cb4cd92b349649c82a0929b43eb6bc29656f3ebd93e7f8d8796ca0714ba6d

<tr><td>79</td><td>Au</td><td><a href="gold.htm">gold</a></td><td>&nbsp;196.966&nbsp;570(4)</td><td></td></tr>

Referencing norms: el-79, name-79, saw-79, sym-79, z-79

en · official · sha256:5161c30b73ebcbea859c02a11819f246229f8e0bc95453dbffe88e1faf575642

<tr><td>8</td><td>O</td><td><a href="oxygen.htm">oxygen</a></td><td>&nbsp;[15.999&nbsp;03,&nbsp;15.999&nbsp;77]</td><td><a href="#m">m</a></td></tr>

Referencing norms: el-8, name-8, note-8-m, saw-8, sym-8, z-8

en · official · sha256:1cc9c3cde5467284448f937962277ccb07d0ba080464c41ab3a49d9cf202d0da

<tr><td>80</td><td>Hg</td><td><a href="mercury.htm">mercury</a></td><td>&nbsp;200.592(3)</td><td></td></tr>

Referencing norms: el-80, name-80, saw-80, sym-80, z-80

en · official · sha256:2b2a61b59ec26b22e8cc18b14d8041108358c96043c53710bffb6fdd4e9a348e

<tr><td>81</td><td>Tl</td><td><a href="thallium.htm">thallium</a></td><td>[204.382,&nbsp;204.385]</td><td></td></tr>

Referencing norms: el-81, name-81, saw-81, sym-81, z-81

en · official · sha256:b0dc2b238fe633ebb0a1a8d5db4db5686645bd3b0fd5da60f55b1a0e6d4774e7

<tr><td>82</td><td>Pb</td><td><a href="lead.htm">lead</a></td><td>[206.14,&nbsp;207.94]</td><td></td></tr>

Referencing norms: el-82, name-82, saw-82, sym-82, z-82

en · official · sha256:afc9eec04783d392f42cfae133c714828be051dce47c5a0abd7b7ca490a08cc7

<tr><td>83</td><td>Bi</td><td><a href="bismuth.htm">bismuth</a></td><td>&nbsp;208.980&nbsp;40(1)</td><td></td></tr>

Referencing norms: el-83, name-83, saw-83, sym-83, z-83

en · official · sha256:9ed199988089efd7aa53a450ea2b4eb338acd5b3b08dcde7db0b48ef24ffcd59

<tr><td>84</td><td>Po</td><td>polonium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-84, name-84, saw-84, sym-84, z-84

en · official · sha256:c9de6448cebe36c6e99dd67e315b5bf7a07ee01322a3312fb9015f5131601487

<tr><td>85</td><td>At</td><td>astatine</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-85, name-85, saw-85, sym-85, z-85

en · official · sha256:1e3ad936756614662f3ff21ef037f0bfde094ccb0c1f83f043ad3fb24b8d0fec

<tr><td>86</td><td>Rn</td><td>radon</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-86, name-86, saw-86, sym-86, z-86

en · official · sha256:2abf77e21955be4eaacb23f4df71b311d8a6c38dff97eb0ab7bc46edea19f148

<tr><td>87</td><td>Fr</td><td>francium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-87, name-87, saw-87, sym-87, z-87

en · official · sha256:24652c281241744029e109bef316227e878a7800ed0397d76f03bec339889d12

<tr><td>88</td><td>Ra</td><td>radium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-88, name-88, saw-88, sym-88, z-88

en · official · sha256:c04928201c85e5cee52896d87a9a11ab0ce217127b4242377b7654cd47dc7a20

<tr><td>89</td><td>Ac</td><td>actinium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-89, name-89, saw-89, sym-89, z-89

en · official · sha256:7409862231a5a51b279a6c17911cbd452e3b5f744a21638eef6a28560ec00eba

<tr><td>9</td><td>F</td><td><a href="fluorine.htm">fluorine</a></td><td>&nbsp;&nbsp;18.998&nbsp;403&nbsp;162(5)</td><td></td></tr>

Referencing norms: el-9, name-9, saw-9, sym-9, z-9

en · official · sha256:610ce53e8cd4f67d41757aa6a376ab08226642970737a7e3317622a5f4e878e0

<tr><td>90</td><td>Th</td><td><a href="thorium.htm">thorium</a></td><td>&nbsp;232.0377(4)</td><td><a href="#g">g</a></td></tr>

Referencing norms: el-90, name-90, note-90-g, saw-90, sym-90, z-90

en · official · sha256:faf0bb77e7cc7949369658777c0f0610c1ff1f66f0d01cef32464aa4db78f504

<tr><td>91</td><td>Pa</td><td><a href="protactinium.htm">protactinium</a></td><td>&nbsp;231.035&nbsp;88(1)</td><td></td></tr>

Referencing norms: el-91, name-91, saw-91, sym-91, z-91

en · official · sha256:2b44c26b0ad3b548bce5a6011a2e1f72cc2be12a126f4dc9d0e65b042a096b14

<tr><td>92</td><td>U</td><td><a href="uranium.htm">uranium</a></td><td>&nbsp;238.028&nbsp;91(3)</td><td><a href="#g">g</a> <a href="#m">m</a></td></tr>

Referencing norms: el-92, name-92, note-92-g, note-92-m, saw-92, sym-92, z-92

en · official · sha256:c1faa35d4b547c85506c4dc628c0065bbf3695134cea4d8badc096efeda60f56

<tr><td>93</td><td>Np</td><td>neptunium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-93, name-93, saw-93, sym-93, z-93

en · official · sha256:e16410474e6be7cbd2b427971a7b68af2bd056adb9b7193ce5ef14493cb60ae1

<tr><td>94</td><td>Pu</td><td>plutonium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-94, name-94, saw-94, sym-94, z-94

en · official · sha256:f8302671964f93737bbd269b90dee366eaf2b0ec6e4344ac35e215f8a642e867

<tr><td>95</td><td>Am</td><td>americium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-95, name-95, saw-95, sym-95, z-95

en · official · sha256:f6062b7e0775153769cefea7a5504cf80b8eddde0bacab52dac29fbbb394f1f9

<tr><td>96</td><td>Cm</td><td>curium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-96, name-96, saw-96, sym-96, z-96

en · official · sha256:cfc4d040321c9943f8d5db17a86830cc5b0ab5a341ca2349fb4d1352e97ad7b9

<tr><td>97</td><td>Bk</td><td>berkelium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-97, name-97, saw-97, sym-97, z-97

en · official · sha256:27fac52426690cda799beeff6fd1db9ac6d7766e478c0d2ff943593d09e4c573

<tr><td>98</td><td>Cf</td><td>californium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-98, name-98, saw-98, sym-98, z-98

en · official · sha256:e0374b7cee1c542fe7c5c52004233617c81a1040c9df6ed526442d2664829cf0

<tr><td>99</td><td>Es</td><td>einsteinium</td><td>&nbsp;&mdash;</td><td></td></tr>

Referencing norms: el-99, name-99, saw-99, sym-99, z-99

en · official · sha256:4045e76f47dc81114bc2001aeb3473f76777d8f7d7a8721929f41c62ccb2333f

The most recent Standard Atomic Weights are presented in this Table and they are based on the <a href="publications.htm" target="_blank">"Atomic Weights 2021"</a> report. Standard Atomic Weights of gadolinium, lutetium, and zirconium have been revised by the CIAAW in 2024 and these revisions are included in this table.

en · official · sha256:9e7c5f91fd9ae702dc19226288b9d9b59a19579d2d7a2c9e939e347ebbc41d9f

<name>Standard Atomic Weights 2024</name>

Referencing norms: CompositionByElement, ElementTableClosure

en · official · sha256:d78e9f6078bbeab100903b20272b627be18db566cd3b70f93c237ad262dd2f2f

Standard atomic weights are CIAAW recommended values for atomic weights applicable to all <a href="normal-materials.htm">normal materials</a>. Since 1902, the Commission regularly publishes critical evaluation of atomic weights of elements and below is the most recent definitive table of the standard atomic weights.

Referencing norms: ElementTableClosure, HasIntervalWeight, HasValueWeight

en · official · sha256:d3bbcd6e14bbc3f7cd475209f042cb062d9d76d6c5a242a2ff85f0bc0fff37ea

id="g">g&nbsp;</font>Geological and biological materials are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such materials and that given in the table may exceed the stated uncertainty.

Referencing norms: WeightQualified

en · official · sha256:64a1e849c17a4250e41a294285409e22419c99e951f9ed49bf4c60133dc2457e

id="m">m&nbsp;</font>Modified isotopic compositions may be found in commercially available material because the material has been subjected to some undisclosed or inadvertent isotopic fractionation. Substantial deviations in atomic weight of the element from that given in the table can occur.

Referencing norms: WeightQualified

en · official · sha256:f2ad3d7e0485de18618c6f7882060b5592f615d6d3538719f255bad5eeaede5d

id="r">r&nbsp;</font>Range in isotopic composition of normal terrestrial material prevents a more precise standard atomic weight being given; the tabulated value and uncertainty should be applicable to normal material.

Referencing norms: WeightQualified

en · official · sha256:ebd6eb8533038a7d8511293eff15816d2f273ff067a1244c3d5e4e5f8f0b98d9

The reported uncertainties of the standard atomic weights are such that the atomic-weight values of <a href="normal-materials.htm">normal materials</a> are expected to lie in the given interval with great certitude. Thus, the standard atomic weight of argon, <i>A</i>_r&deg;(Ar) = [39.792, 39.963], indicates that atomic-weight values of argon in <a href="normal-materials.htm">normal materials</a> are expected to be from 39.792 to 39.963. For iridium, the standard atomic weight <i>A</i>_r&deg;(Ir) = 192.217 &plusmn; 0.002 indicates that atomic-weight values of iridium in <a href="normal-materials.htm">normal materials</a> are expected to be from 192.215 to 192.219.

Referencing norms: ElementMassFromTable, IntervalWeight, RangeFromInterval, RangeFromUncertainty