The bond angle in NH3 is significantly smaller than the ideal bond angle of 109.5° because...

The bond angle in NH₃ is significantly smaller than the ideal bond angle of 109.5° because of the lone pair on the central atom. Which best explains why the bond angle in SO₂ is very close to 120° despite there being a lone pair on the central atom?

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Expert Solution

In SO2 you have 2 double bonds and one lone pair. 3 electron regions so the default angle is 120 degrees. The extra repulsion between the loanpair and double bond accounts for reduction to 119.

In NH3 you have 3 single bond and one loan pair. 4 electron regions so the default angle is about 109 Degrees.

Mainly In NH3 3 atoms and one loan pair leads to 107.3 Deg

In SO2 2 atoms and one loan pair leads to ~ 119 Deg

queen_honey_blossom answered 10 months ago

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