The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+ (Z=64), respectively, are: (A) [Xe] 5f7 and 7.9 (B) [Xe] 5f7 and 8.9 (C) [Xe] 4f7 and 7.9 (D) [Xe] 4f7 and 8.9

Question

The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+ (Z=64), respectively, are:

(A) [Xe] 5f7 and 7.9
(B) [Xe] 5f7 and 8.9
(C) [Xe] 4f7 and 7.9
(D) [Xe] 4f7 and 8.9

Prashant Kotian · Accepted Answer

Correct answer: C. Electronic configuration of 64Gd = [Xe] 4F7 5d1 6s2 64Gd3+ = [Xe] 4F7 No. of unpaired electron = 7 BM ) n ( n     = 7.93 BM

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