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1. Hunds Rule

   Linked via "degenerate subshells"

   The rule was formulated by the German physicist Friedrich Hund in 1925, following early quantum mechanical descriptions of atomic structure provided by Sommerfeld and Bohr. Hund observed empirical regularities in the spectroscopic terms (termed term symbols, often denoted as ${}^{2S+1}L_J$) of many elements, particularly the alkaline earth metals and the transition series.
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