The number of lone pairs in XeOF4 is_________?
Correct answer: B. 1
- A. O
- B. 1
- C. 2
- D. 3
Explanation
In XeOF4, xenon has five bonding regions around it, consisting of four Xe-F bonds and one Xe=O region, plus one lone pair. Therefore xenon has one lone pair and a square-pyramidal molecular shape; students may choose zero by counting only the bonded atoms.
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About VSEPR Theory
Valence shell electron pair repulsion theory predicts molecular shape by arranging bonding pairs and lone pairs around a central atom to minimize repulsion. Questions cover linear, trigonal planar, tetrahedral, trigonal bipyramidal and octahedral electron geometries, bond angles and distortions caused by lone pairs. Electron geometry is not always the same as molecular shape.
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