JEE Main · 2024 · 06 Apr 2024 · Shift 2 · d and f Block Elements

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Arrange the following elements in the increasing order of 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:

(A)(C) $<$ (E) $<$ (B) $<$ (A) $<$ (D)
(B)(B) $<$ (C) $<$ (D) $<$ (E) $<$ (A)
(C)(A) $<$ (D) $<$ (C) $<$ (B) $<$ (E)
(D)(A) $<$ (D) $<$ (C) $<$ (E) $<$ (B)✓ Correct

Answer: (D)

Solution

Ground-state configurations: Sc

[Ar] 3 d^{1} 4 s^{2}

(1 unpaired), Ti

[Ar] 3 d^{2} 4 s^{2}

(2 unpaired), V

[Ar] 3 d^{3} 4 s^{2}

(3 unpaired), Mn

[Ar] 3 d^{5} 4 s^{2}

(5 unpaired), Cr

[Ar] 3 d^{5} 4 s^{1}

(6 unpaired, from the extra stability of a half-filled

3 d

shell). Increasing order:

Sc (1) < Ti (2) < V (3) < Mn (5) < Cr (6)

, i.e. (A) < (D) < (C) < (E) < (B).

JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Single correct option

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