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There is a move discussion in progress on Talk:Group 3 element which affects this page. Please participate on that page and not in this talk page section. Thank you. —RMCD bot 21:15, 15 January 2013 (UTC)[reply]

When you study the periods you are not so concerned with the chemical properties as you are about how the structural size of the atomic nucleus is being increased and by what set of stable isotopes. It is notable that the elements of period 3 are stable with only 1 or 2 extra neutrons except at the end where 16S is noted to have a small constituency (0.01%) with 4 and 17Cl (24%) with 3. The element 18Ar is noted to have a large percentage (99.6%) with 4, but those are indicated to due to spallation rather than nucleosynthesis. So at this level of structural creation, the accumulative forces of nature are unable to create more than a minimum complexity of structure, and which then changes drastically coincident with the beginning of the period 4 series where the first even z element 20Ca is capable o0f being stable with from zero to 8 extra neutrons.WFPM (talk) 23:00, 15 March 2013 (UTC) OOPS! I meant to put this in the talk section of Period 3 elements. Could somebody who knows how please do that for me. And Apologies!WFPM (talk) 23:14, 15 March 2013 (UTC)[reply]

 Done Double sharp (talk) 09:05, 16 March 2013 (UTC)Thank you.WFPM (talk) 17:12, 17 March 2013 (UTC)[reply]

You're welcome. Double sharp (talk) 06:32, 12 July 2014 (UTC)[reply]

The term “post-transition metal” makes sense for the whole group 13 – it stands after the groups 3–11, dammit. But such characterization of aluminium is, literally, nonsensical, and is particularly nonsensical where the period 3 is considered in isolation. No groups 3–12 at all. May I replace the thing in the table with something like [[post-transition metal|p-block metal]]? Incnis Mrsi (talk) 16:42, 11 August 2019 (UTC)[reply]