La, Lu, Ac, Lr

[hermanntrude]

Which blocks are these four elements in?

 

I'm sure that some tables show La and Ac as being in the f-block and Lu and Lr in the d-block, whereas some put them all four in the f-block and some put Lu and Lr in the f-block and La and Ac in the d-block.

 

It seems to me the whole mess of transition and inner-transition metals should be put in a d/f-block since there is so much mixing of electronic configurations.

[YT2095]

Ce to Lu are 4F

Th to Lr are 5F

 

La and Ac are both D block

[hermanntrude]

there are periodic tables which place La and Ac in the f-block. There are others which place Lu and Lr in the f-block. Some do both.

 

What do you know that the makers of these tables dont?

[YT2095]

I have an Electronic Configuration chart of the elements in their ground state.

La and Ac have no electrons in the 4 and 5 F.

Ce and Pa onwards do however, Th is classed as 5F0 for some reason even though it`s 6D2!

there is no 5F1

 

if you have the Chemistry Data Book (I have the 2`nd edition) it`s a small red book, have a look on page 5

Edited November 28, 2008 by YT2095

[Comandante]

Who cares about the groups anyway

 

though some order can be helpful at times Try the circular periodic table, don't get dizzy. http://upload.wikimedia.org/wikipedia/commons/6/63/Circular_periodic_table.png

[hermanntrude]

on the wall in our main lecture theatre there is a PT with an f block containing 30 elements! i'm considering burning it