Monday, June 10, 2013

Hunds Rule

       This rule was formulated by German physicist Friedrich Hund around 1927. Every orbital in a sublevel is singly occupied before is doubly occupied . All electrons in singly occupied orbitals have the same spin. ( while filling molecular orbital of equal energy pairing of electrons does not takes place untill all such molecular orbitals are singly filled with electrons having the parallel spins.
Example :

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