I was asked to draw the Lewis structure of NO2-

[omni]

i was asked to draw the Lewis structure of NO2-,
and to write the formal charge of any atoms. so in the picture you can see my tried (the red number is the formal charge).
now i also asked to decide what is the angle ONO. what i know is the shape of this molecule is Bent so the angle will be less than 120 degrees.
but what make the angle to be less than 120 120 degrees?



thanks.

 

[Fewmet]

Lone pairs of electrons (i.e., the pair on N that's not involved in bonding) don't behave quite like bonding pairs. The model is that they are pulled closer to the central atom and spread out, causing a greater repulsive force on the other pairs and making the O-N-O bond angle smaller.

It always seems to me like multiple bonds should have a similar effect. As far as I know, though, that is not supported by experimental results.

 

[omni]

ok i think i got it.

thank you