How many covalent bonds does hydrogen form if each of its unpaired electrons participate in one bond?

A single hydrogen atom can form one covalent bond. A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. The atoms share valence electrons, which are in the atom's outermost shell. Hydrogen has one electron to share. Hydrogen has a 1s valence subshell, which can hold a maximum of two electrons. Hydrogen covalently shares this single electron with other atoms needing extra electrons to fill their valence shell.