The number of molecules/ions having trigonal bipyramidal shape is

Question

Canvas Classes · Accepted Answer

Trigonal bipyramidal shape: 5 bonding pairs + 0 lone pairs on central atom.

Step 1 — Analyse each species:

| Species | Bonds | Lone pairs | Shape |
|---------|-------|-----------|-------|
|  | 5 | 0 | Trigonal bipyramidal ✓ |
|  | 5 | 1 | Square pyramidal ✗ |
|  | 5 | 0 | Trigonal bipyramidal ✓ |
|  | 4 | 0 (d⁸) | Square planar ✗ |
|  | 3 | 0 | Trigonal planar ✗ |
|  | 5 | 0 | Trigonal bipyramidal ✓ |

Step 2:  → 3 species

Answer: 3

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