Is the ionic bond between nitrogen and bromine, stronger than the one between sulphate and sodium?
No, the bond between sulfate and sodium is stronger. For one thing, nitrogen and bnomine bond covalently, not ionicly, so the question is a little fishy in the first place. nitrogen-bromine bonds are weak because they are both strongly attract electrons (they are both electronegative). In the opposite sort of bond, bromine, a halogen, will bond with an alkali metal easily because the alkali metal will give up an electron easily, and a halogen is very electronegative. However, since nitrogen and bromine are both electronegative, bonds between them are weak.
