Hypervalency refers to the phenomenon where an atom in a compound forms more bonds than its usual valency would suggest. It is commonly associated with elements from the third period (and below) of the periodic table, such as sulfur (S), selenium (Se), and tellurium (Te). These elements can expand their valence shell beyond the usual octet rule (eight electrons) and engage in bonding interactions that exceed the eight-electron limit. This phenomenon is observed in compounds containing these elements when they form bonds with highly electronegative elements like fluorine, chlorine, and oxygen.
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[Acenap(TePhBr2)(Br)]
