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Which pair of ions has the same total number of electrons and the same molecular geometry?

1. ClO₃⁻ and CO₃²⁻
2. SO₃²⁻ and NO₃⁻
3. ClO₃⁻ and SO₃²⁻
4. CO₃²⁻ and SO₃²⁻

Correct answer: ClO₃⁻ and SO₃²⁻

Solution

ClO3- and SO3- (each 42 electrons) are both trigonal pyramidal (AX3E), so they share electron count and geometry. The stored pair CO3^2- (32 e, planar) and SO3^2- (42 e, pyramidal) matches on neither.

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