$\mathrm{MgO}$ exist in a rock salt type unit cell. Each $M{g}^{+2}$ ion will be in contact with :

Given,

$\mathrm{Mgo}$ exists in a rock-salt type structure.

In rock salt structure, each $N{a}^{+}$ ion is surrounded by six $\mathrm{cl}-\mathrm{pons}$and each $C{l}^{-}pon$is surrounded by six $N{a}^{+}$pons.

$\therefore M{g}^{+2}$ is surrounded by ${60}^{-2} pons.$