Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) Sc (B) Cr (C) V (D)…
d & f-Block Elements · Class 12 · JEE Main Previous Year Question
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
(A) < (D) < (C) < (B) < (E)
- b
(C) < (E) < (B) < (A) < (D)
- c✓
(A) < (D) < (C) < (E) < (B)
- d
(B) < (C) < (D) < (E) < (A)
(A) < (D) < (C) < (E) < (B)
Ground state unpaired electrons:
| Element | Config | Unpaired e⁻ | |---------|--------|-------------| | Sc (A, Z=21) | [Ar] | 1 | | Ti (D, Z=22) | [Ar] | 2 | | V (C, Z=23) | [Ar] | 3 | | Mn (E, Z=25) | [Ar] | 5 | | Cr (B, Z=24) | [Ar] | 6 |
Key: Cr has the special half-filled configuration → 6 unpaired electrons (more than Mn's 5).
Increasing order: Sc(1) < Ti(2) < V(3) < Mn(5) < Cr(6)
Answer: Option (3)
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