First slide

Characteristics of transition elements

Question

Magnetic moment 2.83 BM is given by which of the following ions?
(At.nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

Easy

A

${Ti}^{3 +}$
B

${Ni}^{2 +}$
C

${Cr}^{3 +}$
D

${Mn}^{2 +}$

Solution

Magnetic moment is given by $μ = \sqrt{n (n + 2)} B . M$ where n = no. of unpaired electrons
$When n = 2, then μ = 2.83 B.M.$
$For {Ti}^{3 +} (3 d^{1}), n = 1; {Cr}^{3 +} (3 d^{3}), n = 3; {Ni}^{2 +} (3 d^{8})$
$n = 2; {Mn}^{2 +} (3 d^{5}), n = 5$
Hence, $N i^{2 +}$ has two unpaired electrons, with magnetic moment 2.83 B.M.

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