Which of the following pairs of elements have the same number of unpaired electrons in their ground state?

Question

Canvas Classes · Accepted Answer

Ground state configurations and unpaired electrons:

| Element | Config | Unpaired e⁻ |
|---------|--------|-------------|
| Sc |  | 1 |
| Ti |  | 2 |
| V |  | 3 |
| Cr |  | 6 |
| Mn |  | 5 |
| Fe |  | 4 |
| Co |  | 3 |
| Ni |  | 2 |
| Cu |  | 1 |

Checking Option (4): Cr and Fe
- Cr:  → 5 (from ) + 1 (from ) = 6 unpaired
- Fe:  → 4 (from ) + 0 (from , paired) = 4 unpaired

Hmm — 6 ≠ 4. Let me check other options.

Option (2): Cr and Mn
- Cr: 6 unpaired; Mn: 5 unpaired → not equal

Actually, per

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