Which of the following electronic configuration would be associated with the highest magnetic moment? [JEE Main 2024, 27…

Magnetic moment is given by:

μ = √[n(n + 2)] BM
(where n = number of unpaired electrons)

Count unpaired electrons using Hund’s rule:

A. [Ar] 3d⁷ → 3 unpaired
B. [Ar] 3d³ → 3 unpaired
C. [Ar] 3d⁸ → 2 unpaired
D. [Ar] 3d⁶ → 4 unpaired

Compare magnetic moments:

n = 4 gives highest value of √[n(n + 2)]

Final Answer:
D. [Ar] 3d⁶