An Allegory is used to tell a story that has characters, a setting, as well as other types of symbols, that have both literal and figurative meanings.
Chlorine is counted among this group along with hydrogen (H 2), iodine (I 2), bromine (Br 2), oxygen (O 2), nitrogen (N 2) and fluorine (Fl 2). With seven electrons in its outermost orbit--one electron short of a stable eight-- the element chlorine exists in nature as a diatomic molecule. This arrangement allows two chlorine atoms to share their outermost orbit electrons, achieving stability, compared to the single atom.
Sodium is an alkali metal, and chlorine is a halogen. This means that sodium contains one electron in its outer orbital and chlorine contains seven electrons in its outer orbital. One electron moves from the sodium atom and attaches to the chlorine atom to fill its outer orbital.