What is the formula for zinc bromide?
The zinc ion will have a charge of +2 and the bromide ion has a charge of -1 because it is a halogen.
Combining the ions in a 1:2 ratio produces a compound which is electrically neutral.
Zinc can sometimes have other oxidation states (+1 for example) but these are pretty rare...
This video discusses some more examples of how to figure out a formula for a compound from its name or vice versa.
Hope this helps!