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Topic: Lanthanides & Actinides!  (Read 4294 times)

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Offline Winga

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Lanthanides & Actinides!
« on: December 20, 2004, 10:45:24 PM »
Does Lanthanum belong to lanthanides & Actinium belong to actinides?

I found some of the periodic tables on the webs which some of them include La & Ac, while others does not! Which one is correct according to IUPAC?
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Offline ATMyller

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Re:Lanthanides & Actinides!
« Reply #1 on: December 21, 2004, 03:05:53 AM »
According to IUPAC La is classed as 4f and Ac is classed as 5f element even neither has any unfilled f shells.
So La & Ac belong to lanthanides and actinides groups, even they have  d1 configuration.
http://www.iupac.org/didac/Didac%20Eng/Didac01/Content/S29.htm
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Chemists do it periodically on table.

Offline Winga

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Re:Lanthanides & Actinides!
« Reply #2 on: December 23, 2004, 01:32:58 AM »
But why Lu & Lr also belong to f-block elements?
They seem to be d-block elements!
« Last Edit: December 23, 2004, 06:34:47 AM by Winga »
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Offline ATMyller

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Re:Lanthanides & Actinides!
« Reply #3 on: December 23, 2004, 04:34:21 AM »
According to my knowledge Lu (4f14 5d1) and Lr (5f14 6d1) do belong to the d-block. I have no idea what IUPAC has been thinking putting 'em to f-block. ???
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