A sodium atom has a single electron in its outermost electron shell, the first and second shells again being full with two and eight electrons respectively. Let us explain the formation of sodium chloride and what changes take place in the electron arrangements of sodium and chloride atoms in the formation of this compound, Cl        +      e–            `|->`              Cl–, chlorine        electron                chlorine ion. The electron configuration for Na is: 1s^2 2s^2 2p^6 3s^1, The electron configuration for Cl is: 1s^2 2s^2 2p^6 3s^2 Figure \(\PageIndex{5}\): Charges of the Monatomic Ions. Figure \(\PageIndex{1}\) is a graphical depiction of this process. Up to four dots are placed above, below, to the left, and to the right of the symbol (in any order, as long as elements with four or fewer valence electrons have no more than one dot in each position).

A sodium atom has a single electron in its outermost electron shell, the first and second shells again being full with two and eight electrons respectively. Let us explain the formation of sodium chloride and what changes take place in the electron arrangements of sodium and chloride atoms in the formation of this compound, Cl        +      e–            `|->`              Cl–, chlorine        electron                chlorine ion. The electron configuration for Na is: 1s^2 2s^2 2p^6 3s^1, The electron configuration for Cl is: 1s^2 2s^2 2p^6 3s^2 Figure \(\PageIndex{5}\): Charges of the Monatomic Ions. Figure \(\PageIndex{1}\) is a graphical depiction of this process. Up to four dots are placed above, below, to the left, and to the right of the symbol (in any order, as long as elements with four or fewer valence electrons have no more than one dot in each position). 