# What is the Lewis structure for a perchlorate ion?

For $\text{perchlorate anion, } C l {O}_{4}^{-}$, there are $7 + 4 \times 6 + 1 = 32 \text{ valence electrons}$ to distribute.
""^(-)O-Cl(=O)_3 You must fill in the lone pairs. Clearly, the negatuve charge is localized on oxygen in this representation, but all the oxygen atoms are formally equivalent.