Which one of the following correctly describes the bonding in a molecule of hydrogen chloride, HCl? Three pairs of electrons are being shared by one hydrogen atom and one chlorine atom, to form a triple covalent bond. These covalent bonds allow both the hydrogen atom and the chlorine atom to have a full outer shell of electrons. One pair of electrons is being shared by one hydrogen atom and one chlorine atom, to form a single covalent bond. These covalent bonds allow both the hydrogen atom and the chlorine atom to have a full outer shell of electrons. Two pairs of electrons are being shared by one hydrogen atom and one chlorine atom, to form a double covalent bond. These covalent bonds allow both the hydrogen atom and the chlorine atom to have a full outer shell of electrons. Four pairs of electrons are being shared by one hydrogen atom and one chlorine atom, to form a quadruple covalent bond. These covalent bonds allow both the hydrogen atom and the chlorine atom to have a full outer shell of electrons.