When the metallic element sodium combines with the nonmetallic element bromine, br2(l), what is the chemical formula of the product?

The element Sodium will form a +1 cation, while the bromine a -1 anion. Since the anion bromine is always a liquid, therefore its symbol is Br2(l). So, the chemical equation for their reaction is: 
2Na(s) + Br2(l) -> 2NaBr(aq)