What is the Lewis structure for resonance form of ClO_2^-?

Dec 16, 2017

${7}_{\text{Cl"+2xx6_"O"+1_"negative charge"=20*"valence electrons}}$ to distribute across 3 centres...
And so....we gots $\text{chlorite ion}$, which distributes 10 electron pairs as required....(there are 2 lone pairs on the doubly bound oxygen....and of course the negative charge is delocalized....
The electronic geometry around chlorine is tetrahedral. The molecular geometry is bent with $\angle O - C l - O \cong {109.5}^{\circ}$ to a first approx.