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JEE Main levelSingle correct optionDifficulty 2 of 3df131

The spin-only magnetic moment of $Gd X^{3 +}$ ( $Z = 64$ , $[Xe] 4 f^{7}$ ) is:

A $0 BM$
B $3.87 BM$
C $7.94 BM$
D $5.92 BM$

Answer: C

Gd X^{3 +}

has

4 f^{7}

, so

n = 7

and

μ = 7 \times 9 = 63 = 7.94 BM

.

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