# Do ionic bonds occur between metal and non-metal ions, non-metal and non-metal ions, or metal and metal ions?

Ionic bonds occur between anions and cations. And cations may be metallic, i.e., ${M}^{2 +}$, or they may be non-metallic, i.e. ammonium salts, $N {H}_{4}^{+}$. And anions, while typically non-metallic, i.e. ${X}^{-}$ $\text{(X = F, Cl, Br)}$, may be metallic, i.e. $C {r}_{2} {O}_{7}^{2 -}$, or $M n {O}_{4}^{-}$, or at least containing a metal centre. Confused yet?