A lone pair refers to a pair of valence electrons that are not shared with another atom and remain localized on a single atom. These electrons are often found in the outermost shell of an atom and can influence the atom's chemical behavior, including bond angles and molecular geometry. Lone pairs are important in the formation of molecular shapes, as they can repel other electron pairs (both bonding and lone pairs) according to the principles of VSEPR (Valence Shell Electron Pair Repulsion) theory.
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