Amongst , , and , the number of species with two lone pairs of electrons is

Question

Amongst , ,  and , the number of species with two lone pairs of electrons is

Canvas Classes · Accepted Answer

Step 1 — Count lone pairs on central atom:

| Species | Bonds | Lone pairs on central atom |
|---------|-------|---------------------------|
|  | 4 | 1 lone pair |
|  | 4 | 2 lone pairs ✓ |
|  | 4 | 0 lone pairs |
|  | 2 | 2 lone pairs ✓ |

Step 2:  and  each have 2 lone pairs → 2 species

Answer: 2

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