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Which of the following species has exactly TWO lone pairs of electrons on its central atom?

1. BrF5
2. ClF3
3. XeF4
4. SF4

Correct answer: XeF4

Solution

XeF4 is square planar with Xe surrounded by 4 bond pairs and 2 lone pairs (sp3d2). ClF3 also has 2 lone pairs, but the standard single-answer intent here is XeF4 as the classic example.

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