Several resonance structures are possible for each of the following ions. For each, draw...

Several resonance structures are possible for each of the following ions. For each, draw these resonance structures, assign formal charges, and select the resonance structure likely to provide the best description for the ion.

a. Selenocyanate ion, SeCN^–

b. Thioformate ion,

c. Dithiocarbonate, [S₂CO]^2- (C is central)