Lewis Dot Diagram: A type of diagram found in chemistry that uses an arrangement of dots around an element's chemical symbol to show the number and bonding of the element's valence electrons.
Unpaired Electron: A solitary electron that is represented on a Lewis Dot Diagram as a single dot on one side of a chemical symbol.
Electron Pair: Two electrons that are represented on a Lewis Dot Diagram as two dots one side of a chemical symbol.