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5 Comments

Jess Tauber wrote:

Late elements

Still, by the time you get to 7p and 8s all bets are off, since now spin-orbit coupling is severe enough to trump quantum-level-only placement. I forgot to mention the effects of differential shielding in f,d,p,s in my last post. Any comments?

Mon Nov 07 23:54:19 UTC 2011

wrote:

Samuel

Wow Wonderful

Mon Nov 07 18:33:45 UTC 2011

Philip Stewart wrote:

Apologies!

Sorry for double-posting; I've been having trouble with the website.

Mon Nov 07 14:38:30 UTC 2011

Philip Stewart wrote:

Labelling the groups

It sounds like nonsense to say 'Helium is an alkali metal', but if we adopt Janet's system for labelling the groups, the problem disappears: 'Helium is at the head of the s2 group, and hydrogen at the head of s1 '. On this basis there is a problem with elements whose distinguishing electron belongs in the 'wrong subshell'; by that criterion, for example, La and Ac belong in d1, but we can base ourselves on the fact that in most cases the nth element in the f-block has n f electrons. What we are building is ultimately a pattern of patterns, not a table of properties. It is not the properties that dictate the pattern, but the patterns explain the properties.

Mon Nov 07 14:36:50 UTC 2011

Philip Stewart wrote:

Labelling the groups

It sounds like nonsense to say 'Helium is an alkali metal', but if we adopt Janet's system for labelling the groups, the problem disappears: 'Helium is at the head of the s2 group, and hydrogen at the head of s1 '. On this basis there is a problem with elements whose distinguishing electron belongs in the 'wrong subshell'; by that criterion, for example, La and Ac belong in d1, but we can base ourselves on the fact that in most cases the nth element in the f-block has n f electrons. What we are building is ultimately a pattern of patterns, not a table of properties. It is not the properties that dictate the pattern, but the patterns explain the properties.

Mon Nov 07 14:20:28 UTC 2011

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