Question

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

Answer 1

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) 

Answer 2

Answer is: the chemical formula of the product is NaBr (sodium bromide).

Balanced chemical reaction: 2Na(s) + Br₂(l) → 2NaBr(s).

In this chemical reaction, sodium is oxidized from oxidation number 0 (metal) to oxidation number +1 (in NaBr) and bromine is reduced, from oxidation number 0 (bromine nonmetal) to oxidation number -1 (in NaBr).