## Chemistry and Chemical Reactivity (9th Edition)

In $NO_2^+$ the nitrogen makes two double bonds and has no lone electron pair, therefore it has a linear geometry and a bond angle of 180$^{\circ}$. In $NO_2^-$ the nitrogen makes one double and one single bond and has one lone electron pair, therefore it has a bent geometry from the trigonal planar archetype and a bond angle of 120$^{\circ}$.