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What are the respective shapes of the [XeF5]- ion and the XeF5 (i.e. XeOF... actually XeF5 with extra F) - taking [XeF5]- and XeOF3F2 form - state the shapes of [XeF5]- and XeF5(+)? Give the shapes of [XeF5]- and XeF5 species described.

1. pentagonal planar and trigonal bipyramidal
2. trigonal bipyramidal and pentagonal planar
3. octahedral and square pyramidal
4. trigonal bipyramidal and trigonal bipyramidal

Correct answer: pentagonal planar and trigonal bipyramidal

Solution

[XeF5]- (7 electron pairs, 5 bonding + 2 lone) is pentagonal planar, while XeF5+ (6 pairs, 5 bonding + 1 lone) adopts a trigonal bipyramidal (square pyramidal-derived) geometry; the classic pairing is pentagonal planar and trigonal bipyramidal.

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