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.
(1s# 2s# 2p# 3s# 3p# 4s# 3d# 4p# ... etc, where # is the number of electrons in that sublevel. A chlorine ion has 18 electrons (17 e- in a chlorine atom + 1 e- to form the chlorine anion having -1 charge). The shorthand electron configuration begins with the symbol of the noble gas having the closest lower atomic number (the noble gas in the row above the element that you are writing the configuration for). The noble gas you would use to write the configuration for the chlorine ion would be neon (Ne) which has an atomic number of 10.