Covalent bonding occurs when two atoms share a pair of electrons, one from each atom’s outer shell.

What can you conclude from the above information and diagram?

Explanation

The diagram shows each hydrogen atom bonded with one of the two carbon atoms. This can only occur because each hydrogen atom has one electron in its outer shell, which is paired with one electron in the outer shell of a carbon atom. Each carbon atom has four electrons altogether in its outer shell.