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"D-block (for diffuse) elements consist of the transition metals (group 3-12 on the periodic table) in which the outermost electron shell is the D orbital. D-block elements form at least one stable ion with an incompletely filled electron subshell. "

That's not true, is it! E.g. the 3D-Block is in the fourth period, that means the outermost electron shell is the 4S orbital! I'll correct it. Hope everybody agrees.

Is ther a such thing as "25-block"?

IUPAC-Definition (2005)[edit]

New definition:

"The elements of groups 3-12 are the d-block elements. These elements are also commonly refererred to as the transition elements, though the elements of group 12 are not always included." —Preceding unsigned comment added by (talk) 20:18, 4 July 2008 (UTC)


A Way to learn 3d elements:

SupremeCourt - Sc
Tied - Ti
Various - V
CriMinals - Cr, Mn
For - Fe
Controlling - Co
Night - Ni
Club - Cu
Zones - Zn

Nice memory trick but it doesn't belong in the article. JIMp talk·cont 08:10, 25 October 2010 (UTC)

Jensen who?[edit]

Are we supposed to know who this "Jensen" character is? The name is used in this article in 'Einsteinian' fashion. If you read an article about 'atomic orbitals,' I'm sure you would see the name Niels Bohr (with a link to his biography) first, before seeing the mononym 'Bohr.' Try doing a search on "Jensen." (talk) 23:36, 9 August 2012 (UTC)

I inserted the mention of Jensen on 4 August 2010. At the end of the sentence containing his name, there is a little [4] which indicates that the source referred to is described in footnote 4. In this case footnote 4 identifies an article whose author is William B. Jensen. He is not further described in Wikipedia as he is not notable enough. However the source article in the Journal of Chemical Education (JCE) identifies him as a professor in the chemistry department of the University of Cincinnati. He has in fact written a number of historical articles in JCE which are useful sources for Wikipedia.
This is one standard way of referring to the authors of source articles, not only in Wikipedia but also in scientific articles. Dirac66 (talk) 01:00, 10 August 2012 (UTC)

Prof. Jensen is very well known in the inner circles of professionals who deal with issues pertaining to the periodic system of elements. I've corresponded with him myself, in fact. (talk) 05:50, 10 September 2012 (UTC)

correction suggestion[edit]

In following text in the article, shouldn't the "across the periods" replaced by "across the groups"? Because "across the periods" means vertically not horizontally.

In the s-block and p-block of the periodic table, similar properties across the periods are generally not observed: the most important similarities tend to be vertical, down groups. However the d-block is notable in that horizontal similarities across the periods do become important. (talk) 20:43, 29 December 2012 (UTC)

I think "across the periods" means horizontally, although we could replace it with a clearer phrase. Not "across the groups" though, as it seems even less clear. Perhaps "In the s-block and p-block of the periodic table, similarity of properties between the elements of each period is generally not observed; the most important similarities tend to be vertical, down groups. However the d-block is notable in that horizontal similarities between the elements of each period do become important." Dirac66 (talk) 03:02, 30 December 2012 (UTC)