Thu January 05, 2012 By:

What is the role of sub groups S,p,d,f in the periodic classification of elements? explain with example

Expert Reply
Thu January 05, 2012
The last electron of an element enters in which subshell i.e. s,p,d,f ;the element belong to that block of the periodic table. Sub - groups are further division of the groups.
     1s 2, 2s2, 2p6, 3s1
1s2 2s2 2p6 3s2 3p5

1s2 2s2 2p6 3s2 3p6 4s2 3d1
(Xe) 4f1,5d1
The energy of the inner 4f level is nearly the same as that of the outer or valence electrons, and only small energy is required to change the relative occupancy of these electronic levels.
 (Xe) 4f1,5d1
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