Talk:Extended periodic table (large version)

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The g block is 2 elements too long[edit]

The g-block for period 8 should be 18 elements long, not 20 as this illustration shows. Elements 139 and 140 belong in group 13 and 14, respectively, followed by elements 169-172. Compare this to http://en.wikipedia.org/wiki/Pekka_Pyykkö and to the original source DOI: 10.1039/C0CP01575J. Blocks increase by double an odd number, thus s = 2*1 = 2, p = 2*3 = 6, d = 2*5 = 10, f = 2*7 = 14, g = 2*9 = 18. — Preceding unsigned comment added by 2604:2000:C5A0:9400:9D16:96A1:48D2:B214 (talk) 03:05, 1 January 2015 (UTC)