valence-shell-electron-pair repulsion theory

Also known as: VSEPR theory

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In chemical bonding: Molecular shapes and VSEPR theory
There is a sharp distinction between ionic and covalent bonds when the geometric arrangements of atoms in compounds are considered. In essence, ionic bonding is nondirectional, whereas covalent bonding is directional. That is, in ionic compounds there is no intrinsically preferred direction
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