Concept explainers
(a)
Interpretation:
Whether the presence of one or more lone pairs on the central atom is desired or not in diagram (a) has to be indicated.
Concept Introduction:
Valence Shell Electron Pair Repulsion model predicts shape by inclusion of bond angles and most distant arrangement of atoms that leads to minimum repulsion. For the molecules that have no lone pairs around the central atom the bonded-atom unshared -pair arrangement is decided by the table as follows:
In order to determine the shape the steps to be followed are indicated as follows:
- 1. Lewis structure of molecule should be written.
- 2. The type electron arrangement around the central atom should be identified around the central atom. This essentially refers to determination of bond pairs and unshared or lone pairs around central atoms.
- 3. Then bonded-atom unshared -pair arrangement that can maximize the distance of electron pairs about central atom determines the shape.
(b)
Interpretation:
Whether the presence of one or more lone pairs on the central atom is desired or not in diagram (b) has to be indicated.
Concept Introduction:
Refer to part (a).
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Chemical Principles: The Quest for Insight
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