Why the H2O molecule have 104.5 angle?
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Explanation:
An example of bent molecular geometry that results from tetrahedral electron pair geometry is H2O. The water molecule is so common that it is wise to just memorize that water is a BENTmolecule.
The oxygen has 6 valence electrons and thus needs 2 more electrons from 2 hydrogen atoms to complete its octet. This then leaves two lone electron pairs that are not bonded to any other atoms. The two hydrogen atoms and the two lone electron pairs are as far apart as possible at nearly 109obond angle. This is tetrahedral electron pairgeometry.
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