"Methyl" by itself doesn't represent a complete molecule. It's a functional group consisting of one carbon atom bonded to three hydrogen atoms.

So, there are 3 hydrogen atoms in a methyl group.

It's important to note that the methyl group is often part of a larger molecule. For example, methane (CH4) is a molecule with one carbon atom and four hydrogen atoms. This can be thought of as a methyl group (CH3) bonded to an extra hydrogen atom.