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H(2)O molecule is a triatomic molecule b...

`H_(2)O` molecule is a triatomic molecule but its geometry is not linear. Why ?

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The geometry of a covalent molecule does not depend upon the number of atoms present in it but upon the number of electron pairs around the central atom in the molecule. In `H_(2)O` molecule, there are in all four pairs of electrons (two shared pairs and two lone pairs ). According to VSEPR theory , the geometry is irregular. The actual shape of the molecule is angular.
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