The number of molecules or ions from the following which do not have an odd number of electrons are

(A) (B) (C) (D) (E) (F) NO

Question

The number of molecules or ions from the following which do not have an odd number of electrons are

(A)  (B)  (C)  (D)  (E)  (F) NO

Canvas Classes · Accepted Answer

Step 1 — Count total valence electrons for each species:

| Species | Valence electrons | Odd/Even |
|---------|------------------|----------|
|  | N(5)+2O(12) = 17 | Odd |
|  | I(7)+4Cl(28)+1 = 36 | Even ✓ |
|  | Br(7)+3F(21) = 28 | Even ✓ |
|  | Cl(7)+2O(12) = 19 | Odd |
|  | N(5)+2O(12)−1 = 16 | Even ✓ |
| NO | N(5)+O(6) = 11 | Odd |

Step 2 — Species with even (not odd) electron count:
, ,  → 3 species

Answer: 3

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