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PLEASE HELP I HATE CHEM Why do molecules in a tetrahedral shape repel at an angle of 109.5 instead of 90 degrees?!?

PLEASE HELP I HATE CHEM Why do molecules in a tetrahedral shape repel at an angle of 109.5 instead of 90 degrees?!?
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PLEASE HELP I HATE CHEM

Why do molecules in a tetrahedral shape repel at an angle of 109.5 instead of 90 degrees?!?

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User J Hunt
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1 Answer

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This angle is obtained when all four pairs of outer electrons repel each other equally. The bond angles in ammonia and in water are less than 109.5° because of the stronger repulsion by their lone pairs of electrons.
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User Ziyang Liu
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