karla12idh karla12idh

23-09-2020
Chemistry

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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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dhalamundo dhalamundo

23-09-2020

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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