Which of the following pairs of ions are isoelectronic and isostructural?

Question

Canvas Classes · Accepted Answer

Isoelectronic = same number of electrons; Isostructural = same shape

Option (3):  and

| Species | Central atom | O.S. | d config | Electrons | Shape |
|---------|-------------|------|----------|-----------|-------|
|  | Cr(+6) |  | 50 e⁻ total | Tetrahedral |
|  | Mn(+7) |  | 50 e⁻ total | Tetrahedral |

Both have:
- Central metal in high O.S. with  configuration
- 4 oxygen atoms
- Tetrahedral shape
- Same total electron count → isoelectronic ✓
- Same structure → isostructural ✓

Answer: Opti

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