a) [Xe] 4f14 5d3 6s2 = Paramagnetic 3 unpaired electrons
b) Cs caesium - Paramagnetic
c) 39 Y3+ yttrium : [Kr] 4d0 5s0
Ga3+ =[Ar] 3d10 4s0 4p0
Ag+ = [Kr] 4d10 5s0
As3- = [Ar] 3d10 4s2 4p6
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