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.
Gaining an electron will make the element negative. The oxidation number for Cl, or Chlorine, is Cl-1. The element is in the seventh element on the Periodic Table, which means that it has seven outer shell electrons.. Since the element wants to become stable, and it only it needs 8 valence electrons. So therefore, it has to gain one electrons.