Is magnesium and bromine ionic

YES!!!!

Magnesium ionkses to form the magnesium cation .

The two electrons ionised go to a bromine molecule (Br2) , and under electron affinity one electron combines with one bromine atom to for the bromide anion.

Iomisation

Mg(s) = Mg^(2+)(aq) + 2e^(-)

Br2(l) + 2e^(-) = 2Br^(-)

Adding

Mg(s) + Br2(l) = MgBr2(s)