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:

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:

Canvas Classes · Accepted Answer

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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