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

Engineering

Chemistry

Electronic Configuration

Configuration of f Block Elements

Question

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

[Xe] 4f⁷ and 8.9

[Xe] 5f⁷ and 7.9

[Xe] 5f⁷ and 8.9

[Xe] 4f⁷ and 7.9

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Electronic configuration of

₆₄Gd = [Xe] 4F⁷ 5d¹ 6s²

₆₄Gd³⁺ = [Xe] 4F⁷

No. of unpaired electron = 7

$μ = \sqrt{n (n + 2)} BM$

$= \sqrt{63}$

= 7.93 BM