[positiveion]

This was a 2 part question.

Part i
Draw the 2 possible Lewis structures of N3H.

Part ii
Predict the N-N-N and H-N-N bond angles in each case and give your reasoning.

This is the answer scheme:


I successfully drew them both but I don't understand the bond angles part.
Firstly for the N-N-N one i don't get why it is 180 because there is a lone pair on the first N? do you disregard lone pairs if they're not on the centre atom?
Also for I N-N-H i don't understand why there are THREE charge centres? There does not appear to be any a lone pair on the centre N of N-N-H?..

[AWK]

Look at hybridization of nitrogen bonded to hydrogen atom

[Schrödinger]

Firstly for the N-N-N one i don't get why it is 180 because there is a lone pair on the first N? do you disregard lone pairs if they're not on the centre atom?

Why is CO₂ linear although each O has 2 lone pairs?
Why is SO₂ bent ?
What decides geometry? Think about hybridisation