This is when atoms of elements combine by sharing electrons or by the complete transfer of electrons from one atom to another.

Covalent bond

Explanation:

When two atoms have shared electrons, it is not distinguishable from what atom they are because they are shared in the same orbit, it is called a covalent bond.

Atoms in a covalent bond share one or more electrons in the last of their orbitals, the number of electrons in the last orbital will depend on the element in question.

that's what i got you can count the number of atoms