Hydrogen, bromine, and carbon can combine to form a variety of compounds, but the most common and likely one you're looking for is bromomethane (CH3Br).

Here's the breakdown:

* Hydrogen (H): One hydrogen atom

* Bromine (Br): One bromine atom

* Carbon (C): One carbon atom

These elements combine to form a molecule with the chemical formula CH3Br.

Important Note: It's crucial to understand that there can be other possible combinations depending on the specific ratios of each element. However, bromomethane is the most likely and common compound formed with these elements.