Why Does ClNO2 Have Only One Double Bond in Its Lewis Structure?

[JustinLiang]

Homework Statement

Draw the lewis structure for ClNO2

The Attempt at a Solution

When I first drew this I had two double bonds in between the N and the Os. However, the answer suggests only one is a double bond in the structure. Why is this correct? Aren't we suppose to balance the formula charges? When I have 2 double bonds the formal charge for the oxygens are zero (6-4(lone pair electrons)-2(bonds pairs)) and the nitrogen (5-0(lone pair electrons)-5(bond pairs)) is zero as well.

 

[TeethWhitener]

Nitro groups have weird Lewis structures. The best representation is as a resonance between two different structures (pic below), or as a combined structure as seen in this wiki page:
https://en.m.wikipedia.org/wiki/Nitro_compound