The outer electron configuration of Gd (Atomic No : 64) is
1. 4f75d16s2
2. 4f35d56s2
3. 4f85d06s2
4. 4f45d46s2
Answer : 1
Sol :
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The magnetic moment (spin only) of [NiCl4]2-is
Hybridisation of Ni is e-
Unpaired 3d8in is 2
So Ω = n(n+2)BM=2x4 = 8 = 2.82BM
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