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.
A chlorine atom has the electron structure 2, 8, 7. Chlorine is a halogen. See a picture of a chlorine atom. Chlorine is in group 7 (7 electrons in its outer shell) and period 3 (3 shells). The electron structure is also called the electronic structure, the electron configuration or the electronic configuration.