Comparison: Wikidata atomic weights
Standard atomic weights in this data compared with the mass (P2067, in dalton) of the chemical elements in Wikidata, matched on the atomic number. A weight agrees if the Wikidata value is inside the local interval or within the local uncertainty, or if the bounds of a rounded Wikidata value contain the local weight. The comparison is made by check_wikidata_weights.py.
Compared on 2026-11-05: 84 elements in ciaaw.ttl, 174 items in Wikidata.
| Result | Count |
|---|---|
| Different values | 0 |
| No value | 0 |
| Not found | 0 |
| Unexpected unit | 0 |
| Only in the resource | 34 |
Only in the resource
Wikidata has a mass for the element, the local data has no standard atomic weight for it. CIAAW gives none for these elements (no stable isotopes, or not assessed).
| Element | Local | Value in resource | Item | Source |
|---|---|---|---|---|
| technetium | — | 97.907 | Q1054 | PubChem |
| promethium | — | 144.9127559 [144.9127526, 144.9127592] | Q1809 | — |
| polonium | — | 208.9824308 [208.9824288, 208.9824328] | Q979 | — |
| astatine | — | 209.9871479 [209.9871396, 209.9871562] | Q999 | — |
| radon | — | 222.0175782 [222.0175757, 222.0175807] | Q1133 | — |
| francium | — | 223.019736 [223.0197335, 223.0197385] | Q671 | — |
| radium | — | 226.0254103 [226.0254078, 226.0254128] | Q1128 | — |
| actinium | — | 227.028 | Q1121 | PubChem |
| neptunium | — | 237.0481736 [237.0481717, 237.0481755] | Q1105 | — |
| plutonium | — | 244.0642053 [244.0641997, 244.0642109] | Q1102 | — |
| americium | — | 243 | Q1872 | RCSB protein data bank |
| curium | — | 247.07 | Q1876 | PubChem |
| berkelium | — | 247.0703073 [247.0703014, 247.0703132] | Q1882 | — |
| californium | — | 251.0795886 [251.0795838, 251.0795934] | Q1888 | — |
| einsteinium | — | 252.08298 [252.082926, 252.083034] | Q1892 | — |
| fermium | — | 257.095 | Q1896 | PubChem |
| mendelevium | — | 258.0984315 [258.0984265, 258.0984365] | Q1898 | — |
| nobelium | — | 259.10103 [259.10092, 259.10114] | Q1901 | — |
| lawrencium | — | 266.11983 [266.11927, 266.12039] | Q1905 | — |
| rutherfordium | — | 267.12179 [267.12117, 267.12241] | Q1226 | — |
| dubnium | — | 268.12567 [268.1251, 268.12624] | Q1232 | — |
| seaborgium | — | 267.12436 [267.12406, 267.12466] | Q1234 | — |
| bohrium | — | 270.13336 [270.13305, 270.13367] | Q1249 | — |
| hassium | — | 271.13717 [271.13685, 271.13749] | Q1252 | — |
| meitnerium | — | 278.15631 [278.15563, 278.15699] | Q1258 | — |
| darmstadtium | — | 281.16451 [281.16392, 281.1651] | Q1266 | — |
| roentgenium | — | 282.16912 [282.1684, 282.16984] | Q1272 | — |
| copernicium | — | 285.17712 [285.17652, 285.17772] | Q1278 | — |
| nihonium | — | 286.18221 [286.18149, 286.18293] | Q1301 | — |
| flerovium | — | 289.191 | Q1302 | — |
| moscovium | — | 290.19598 [290.19525, 290.19671] | Q1303 | — |
| livermorium | — | 293.20449 [293.20389, 293.20509] | Q1304 | — |
| tennessine | — | 294.21046 [294.20972, 294.2112] | Q1306 | — |
| oganesson | — | 294.21392 [294.21321, 294.21463] | Q1307 | — |