Is mgbr2 a covalent bond or an ionic bond

Tell me the iupac name of the following compounds:

How do you know when a chemical reaction has occurred

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent