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JEE Main · 2024 · 27 Jan 2024 · Shift 1 · d and f Block Elements

Which of the following electronic configuration would be associated with the highest magnetic moment?

(A) $[Ar] 3 d^{7}$
(B) $[Ar] 3 d^{8}$
(C) $[Ar] 3 d^{3}$
(D) $[Ar] 3 d^{6}$ ✓ Correct

Answer: (D)

Solution

Using the spin-only formula

μ = n (n + 2)

BM:

$3 d^{7}$ : 3 unpaired electrons, $μ = 15$
$3 d^{8}$ : 2 unpaired electrons, $μ = 8$
$3 d^{3}$ : 3 unpaired electrons, $μ = 15$
$3 d^{6}$ (high spin): 4 unpaired electrons, $μ = 24$

3 d^{6}

has the most unpaired electrons and hence the highest magnetic moment.

JEE Main · 2024 · 27 Jan 2024 · Shift 1 · Single correct option

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