# What is the Lewis structure of OCN-?

$O = C = {N}^{-} {\leftrightarrow}^{-} O - C \equiv N$?
Valence electrons $=$ ${6}_{O} + {4}_{C} + {5}_{N} + 1$ $=$ $16$. Thus there are 8 electron pairs to distribute over 3 centres. Two resonance structures are avalaible as shown; since oxygen is more electronegative than nitrogen the one on the right might be a better representation of molecular structure.