The number of species below that have two lone pairs of electrons in their central atom is

Question

Canvas Classes · Accepted Answer

Step 1 — Count lone pairs on central atom:

| Species | Bonds | Lone pairs |
|---------|-------|------------|
|  | 4 | 1 |
|  | 4 | 0 |
|  | 3 | 2 ✓ |
|  | 3 | 1 |
|  | 5 | 0 |
|  | 5 | 1 |
|  | 4 | 2 ✓ |
|  | 6 | 0 |

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

Answer: 2

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