Arrange the following elements in the increasing order of the number of unpaired electrons in it.

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Solution

Q.
Arrange the following elements in the increasing order of the number of unpaired electrons in it.

(A) Sc (B) Cr (C) V (D) Ti (E) Mn

Choose the correct answer from the options given below: [2024]

1
(A) < (D) < (C) < (B) < (E)

2
(B) < (C) < (D) < (E) < (A)

3
(A) < (D) < (C) < (E) < (B)

4
(C) < (E) < (B) < (A) < (D)

Ans.
(3)

Element and electronic
configuration Number of unpaired
electrons

(A) ${}_{21}{Sc} = {}_{18}{[Ar]} 3 d^{1} 4 s^{2}$ 1

(B) ${}_{24}{Cr} = {}_{18}{[Ar]} 3 d^{5} 4 s^{1}$ 6

(C)    ${}_{23}V = {}_{18}{[Ar]} 3 d^{3} 4 s^{2}$ 3

(D)    ${}_{22}{Ti} = {}_{18}{[Ar]} 3 d^{2} 4 s^{2}$ 2

(E)    ${}_{25}{Mn} = {}_{18}{[Ar]} 3 d^{5} 4 s^{2}$ 5

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