# What are the charges of oxide, and fluoride anions?

Clearly, $\text{oxide anion,}$ ${O}^{2 -}$, is a doubly charged anion, whereas ${F}^{-}$ is singly charged. But both anions have the same number of electrons.
Nevertheless, fluoride anion has a higher $\text{nucular charge}$, $Z = 9$ versus $Z = 8$.