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When will hund's ruleHund's rules fail?

I heard someone mentioned that hund's rule doesHund's rules do not always work.

Looking at atomic spectrum: (https://qudev.phys.ethz.ch/phys4/PHYS4_lecture10v1_2page.pdf page 10 Hg spectrum) How could singlet (with multiplicity 1) has lower energy than triplet (with multiplicity 3)?

When will hunds' fail and how do we work with them?

When will hund's rule fail?

I heard someone mentioned that hund's rule does not always work.

Looking at atomic spectrum: (https://qudev.phys.ethz.ch/phys4/PHYS4_lecture10v1_2page.pdf page 10 Hg spectrum) How could singlet (with multiplicity 1) has lower energy than triplet (with multiplicity 3)?

When will hunds' fail and how do we work with them?

When will Hund's rules fail?

I heard someone mentioned that Hund's rules do not always work.

Looking at atomic spectrum: (https://qudev.phys.ethz.ch/phys4/PHYS4_lecture10v1_2page.pdf page 10 Hg spectrum) How could singlet (with multiplicity 1) has lower energy than triplet (with multiplicity 3)?

When will hunds' fail and how do we work with them?

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When will hund's rule fail?

I heard someone mentioned that hund's rule does not always work.

Looking at atomic spectrum: (https://qudev.phys.ethz.ch/phys4/PHYS4_lecture10v1_2page.pdf page 10 Hg spectrum) How could singlet (with multiplicity 1) has lower energy than triplet (with multiplicity 3)?

When will hunds' fail and how do we work with them?