AP EAPCET 25-Aug-2021 Shift 1 Paper

In the periodic table of elements, gallium (Ga) is grouped in the boron family (group 13) which include the semi-metal boron (B) and the metals aluminium ( Al ), gallium (Ga), indium (In) and thalium (Tl).
Ga(Z=31)=[Ar]4s23d104p1
Al(Z=13)=[Ne]3s23p1