what would be the electronic configuration fm Na+,Al3+,O2-,Cl-
Na+ = 2,8
Al3+ =2,8
O2- = 2,8
Cl- = 2,8,8
As all these are ions, they have lost/gained electrons.
So they will have the Configuration like when they lose/gain electrons
Na = 2,8,1
Al = 2,8,3
O = 2,6
Cl = 2,8,7