Preferred Label : hypervalency;
IUPAC definition : The ability of an atom in a molecular entity to expand its valence shell beyond the
limits of the Lewis octet rule. Hypervalent compounds are common for the second and
subsequent row elements in groups 15–18 of the periodic table. A description of the
hypervalent bonding implies a transfer of the electrons from the central (hypervalent)
atom to the nonbonding molecular orbitals which it forms with (usually more electronegative)
ligands. A typical example of the hypervalent bond is a linear three-centre, four-electron
bond, e.g. that of F sub ap /sub –P–F sub ap /sub fragment of PF sub 5 /sub .;
Origin ID : HT07054;
See also
The ability of an atom in a molecular entity to expand its valence shell beyond the
limits of the Lewis octet rule. Hypervalent compounds are common for the second and
subsequent row elements in groups 15–18 of the periodic table. A description of the
hypervalent bonding implies a transfer of the electrons from the central (hypervalent)
atom to the nonbonding molecular orbitals which it forms with (usually more electronegative)
ligands. A typical example of the hypervalent bond is a linear three-centre, four-electron
bond, e.g. that of F sub ap /sub –P–F sub ap /sub fragment of PF sub 5 /sub .
