Question

How to determine the structure of unknown compound from valence shell electron pair repulsion theory

Answer 1

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⏩Draw the Lewis structure.Count the number of electron groups and identify them as bond pairs of electron groups or lone pairs of electrons.Remember electron groups include not only bonds , but also lone pairs! ⏪

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Answer 2

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• There is no direct relationship between the formula of a compound and the shape of its molecules. The shapes of these molecules can be predicted from their Lewis structures, however, with a model developed about 30 years ago, known as the valence-shell electron-pair repulsion (VSEPR) theory.

• The VSEPR theory assumes that each atom in a molecule will achieve a geometry that minimizes the repulsion between electrons in the valence shell of that atom. The five compounds shown in the figure below can be used to demonstrate how the VSEPR theory can be applied to simple molecules.

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