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Subject - General Chemistry
Hund's rules developed in 1927 by Friedrich Hund determine the energetic sequence of term symbols associated with a certain electron configuration of an atom:
- In term symbols derived from equivalent electrons, the term with the highest spin multiplicity shows the lowest energy.
- If several term symbol meet this criterion, the one with the highest orbital degeneration (maximum ) shows the lowest energy.
- The energy of the lowest levels increases with values if the values are derived from a less than half occupied orbital, otherwise it decreases.