" It is associated with the fact that singly occupied orbitals within a system share the same spin, and it also is associated with the Pauli Exclusion Principle.
Depending on the source, you will find one, three, or four of these rules named after a 20th Century German. The most common one can be stated as "The term with the maximum multiplicity lies lowest in energy." It is associated with the fact that singly occupied orbitals within a system share the same spin, and it also is associated with the Pauli Exclusion Principle. Name this rule that explains how orbitals within a subshell are filled as you move across the periodic table.
Depending on the source, you will find one, three, or four of these rules named after a 20th Century German.
Hund(’s Rule(s))