Question

What is meant by Inner Core of electronic configuration ?

Answer 1

The inner core of electronic configuration represents the inner shells or the shells other than valence shells.For example; In the electronic configuration of Al; 1s2 2s22p6 3s2 3p1, the electrons in the 1s and 2s, 2p sub-shell represents the inner core and the electrons in the 3s and 3p sub-shell are the valence electrons.

Answer 2

it means that the electronic configuration is filled by 2,8,8,18,18,32,32