Chlorine (Cl2) is a diatomic molecule, meaning it consists of two chlorine atoms bonded together. The bond between these atoms is a covalent bond, not an ionic bond. In a covalent bond, electrons are shared between atoms, whereas in an ionic bond, electrons are transferred from one atom to another.

The electronegativity of chlorine is 3.0, which means that it has a high affinity for electrons. However, the difference in electronegativity between chlorine and chlorine is not great enough to cause electron transfer. As a result, the bond between chlorine atoms is covalent.

The covalent bond in Cl2 is a single bond, meaning that there is only one pair of electrons shared between the two atoms. This bond is relatively weak, which is why Cl2 is a gas at room temperature.