Talk:Periodic table (wide)

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The Usborne Illustrated Dictionary of Chemistry shows a similar periodic table to this one, except atomic numbers 21 and 39 are over to the left (next to 20 and 38).

Yes, looking at it again, I think that's correct. but I've just tried it and the main transition block looks odd -- it has a corner bitten out of it. hmmm. I may have got it wrong. I'll leav it as is for now until a proper chemist comes along -- Tarquin 09:31, 20 Aug 2003 (UTC)

According to the print version of the WebElements periodic table (found here, as a PDF file), Sc and Y should be directly above Lu and Lr. That periodic table cites "W.V. Jensen, 'The positions of lanthanu (actinum) and lutetium (lawrencium) in the period table', J. Chem. Ed., 1982, 59, 634-636" as justification. – Minh Nguyen 19:19, 28 Feb 2004 (UTC)

Lutetium and Lawrencium were colored incorrectly. Many publishers make the mistake of putting them with the f-block (Lanthanides and Actinides), when in fact they are d-block (transition metals). This is done in the short form to allow for lines or whatever to be drawn from Barium and Radium to Lanthanum and Actinium, or to allow the entire f-block plus Lu and Lr to be squeezed under Sc and Y. This is why the short form sucks. The issue has been corrected (here, at least). 71.198.156.164 21:07, 4 October 2006 (UTC)

You are oversimplifying reality by equating the f-block with the lanthanides and actinides and equating the d-block with the transition metals. See the discussion at Talk:Periodic_table_(standard)#Layout. And please register. Flying Jazz 01:20, 20 December 2006 (UTC)

[edit] 92 or 90?

I've heard it said frequently that there are ninety two naturally occuring elements, yet here I count only 90 that aren't red. What gives? Why are two of them counted as naturally occuring if they are synthetic? —The preceding unsigned comment was added by 69.166.72.148 (talk • contribs) .

Depends on the definitions, there's no single consistent one. See also Wikipedia talk:WikiProject Elements#Primordial plutonium? and related talk. Femto 10:41, 5 October 2006 (UTC)

69.166.72,148, the people you've heard might simply be overlooking technetium and prometium. 130.238.197.120 10:19, 27 July 2007 (UTC)

[edit] Elements liquid at STP

Here is a quote from the entry on Mercury, Hg.

mercury is one of five elements that are liquid at or near standard room temperature and pressure[1] (the others are the metals caesium, francium, and gallium, and the nonmetal bromine)

So in addition to the numbers 80-Hg and 35-Br, the following other numbers should be in blue (assuming the above excerpt is correct): 55-Cs, 87-Fr, 31-Ga. Neoprote 11:17, 16 March 2007 (UTC)

[edit] Actinides/Lanthanides

Why are the Actinides/Lanthanides element boxes thinner than the others? Can someone fix this?--129.70.14.128 (talk) 17:41, 27 February 2008 (UTC)