Question

Write electron configuration for the following ions: (5) (i) Fe3+ (ii) Cr3+ (iii) Pb2+ (iv) Pb 4+ (v) O2

Answer 1

Fe3+=1s2 2s2 2p6 3s2 3p6 4s2 3d3
Cr3+=1s2 2s2 2p6 3s2 3p6 4s2 3d1
Pb2+= [Xe] 6s2 4f14 5d10
Pb4+= [Xe] 4f14 5d10
O2= 1s2 2s2 2p6 3s2 3p4