Preferred Label : Hund rules;
IUPAC definition : in configurations containing shells less than half full of electrons, the term having
the lowest total angular momentum j lies lowest in energy, whereas in those with shells
more than half filled, the term having the largest value of j lies lowest (fine structure
rule). hund rules apply if the russell–saunders coupling scheme is valid. sometimes
the first rule is applied with questionable validity to molecules.; among multiplets having the same multiplicity, the lowest-energy one is that with
the largest total orbital angular momentum (angular momentum rule) (valid if the total
orbital angular momentum is a constant of motion).; of the different multiplets resulting from different configurations of electrons in
degenerate orbitals of an atom those with greatest multiplicity have the lowest energy
(multiplicity rule).;
Origin ID : H02871;
See also
in configurations containing shells less than half full of electrons, the term having
the lowest total angular momentum j lies lowest in energy, whereas in those with shells
more than half filled, the term having the largest value of j lies lowest (fine structure
rule). hund rules apply if the russell–saunders coupling scheme is valid. sometimes
the first rule is applied with questionable validity to molecules.
among multiplets having the same multiplicity, the lowest-energy one is that with
the largest total orbital angular momentum (angular momentum rule) (valid if the total
orbital angular momentum is a constant of motion).
of the different multiplets resulting from different configurations of electrons in
degenerate orbitals of an atom those with greatest multiplicity have the lowest energy
(multiplicity rule).
