Bromine Will Form Compounds with Each of the Other Elements

Bromine will form compounds with each of the other elements in Period 4 of the periodic table. How does the type of bonding in the compounds change as one moves from potassium bromide to selenium bromide?

A) ionic to polar covalent
B) polar covalent to ionic
C) polar covalent to non-polar covalent
D) coordinate covalent to polar covalent
E) none of the above