Help:PTCC
The periodic table as shown in the English wikipedia (enwiki) uses categories to mark the metallicity of the elements. Each category has its legend color. Both the label "category" and its associated color are editorial choices (chosen by enwiki editors).
The categorisation is based on science, WP:RS. The colors used are chosen wiki-local.
Periodic table
[edit]| Group | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | |
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| Hydrogen & alkali metals |
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Primordial From decay Synthetic Border shows natural occurrence of the element
Standard atomic weight Ar, std(E)[1]
- Ca: 40.078 — Abridged value (uncertainty omitted here)[2]
- Po: [209] — mass number of the most stable isotope
On commons
[edit]Talk central
[edit]Discussions are at WT:ELEMENTS. You are invited.
See also
[edit]- ↑ Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–291. doi:10.1515/pac-2015-0305.
- ↑ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.