Electrons and chemical bonds

Lewis suggested that chemical reactions involve the transfer of electrons from one atom to another, establishing molecular bonds. These electrons can appear in different configurations: a full outer orbital means an unreactive element (e.g. noble gas), but an outer orbital missing one electron (e.g. chlorine) is very reactive.
 Gilbert Newton Lewis United States 1916 Electrons and chemical bonds

Lewis suggested that chemical reactions involve the transfer of electrons from one atom to another, establishing molecular bonds. These electrons can appear in different configurations: a full outer orbital means an unreactive element (e.g. noble gas), but an outer orbital missing one electron (e.g. chlorine) is very reactive.