Talk:Extended periodic table (detailed cells)

The g block is 2 elements too long

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)

There are many reasonable ways to draw the eighth period, but given that there is not expected to be much of a chemical difference between E139 and E140 and the other superactinides, tagging them along to the 5g row as Fricke and Nefedov do seems more chemically sensible. Double sharp (talk) 03:53, 22 February 2018 (UTC)

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Sc, Y, place

Based on https://www.meta-synthesis.com/webbook/35_pt/pt_database.php?PT_id=920, periodic table shall have Sc, Y above Lu, Lr by the most current version. Please check this version. Thanks.Luke Kern Choi 5 (talk) 00:39, 5 May 2018 (UTC)

G-block?

If s hold 2, p hold 6, d hold 10, and f hold 14, then g hold 18. I think 168 is in noble gas. -198.111.211.2 (talk) 16:53, 16 November 2018 (UTC)

The 5g orbitals indeed hold 18 electrons, but because of the relativistic collapse of 8s and 8p_1/2, by the time you get to the 7d elements the covering s-shell is 9s instead of 8s, and in the 8p elements the six p-electrons come from 9p_1/2 (two) and 8p_3/2 (four) together. So we have to add in four extra electrons from 9s and 9p_1/2 before we get to the noble gas at 172. See the main extended periodic table article. Double sharp (talk) 04:54, 1 August 2019 (UTC)