Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Out of Mn3+ and Cr3+, which is more paramagnetic and why ? (Atomic nos. : Mn = 25, Cr = 24) - Chemistry

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Out of Mn3+ and Cr3+, which is more paramagnetic and why ?

(Atomic nos. : Mn = 25, Cr = 24)

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Solution 1

Mn3+ has four unpaired electrons (d4) in its valence shell whereas Cr3+ (d3) has three unpaired electrons. Thus, Mn3+ is more paramagnetic than Cr3+.

Solution 2

Mn+3 = [Ar] 4s0 3d4 (4 unpaired e-)

Cr+3 = [Ar] 4s0 3d3 (3 unpaired e-)

Mn+3 has more no. of unpaired e- than Cr+3

Concept: General Properties of the Transition Elements (D-block)
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