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Which pair of species has the same total count of valence electrons and both exhibit a linear geometry?

1. IBr2− and XeF2
2. IBr2− and XeF4
3. IBr2− and XeF6
4. IBr2− and XeF8

Correct answer: IBr2− and XeF2

Solution

IBr2− and XeF2 both have 22 valence electrons and exhibit linear geometry due to sp3d hybridization with three lone pairs on the central atom, leading to a linear shape.

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