define hund's rule?
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Hund's rule: every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.
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Hund's Rule - Hund's Rule concerns the distribution of electrons in a set of orbitals of the same energy that is sub shell. According to this rule if a number of orbitals of the same sub-shell are available then electrons distribute in such a way that each orbital is first singly occupied with same spin.
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