In this video explains Hund's rule of maximum multiplicity. According to this rule, electron pairing will not take place in orbitals of same energy (same sub-shell) until each orbital is first singly filled with parallel spin. In other words in a set of orbitals having same energy (degenerate orbitals), the electrons distribute themselves to occupy separate orbitals with same spin as far as possible. This rule can be illustrated by considering the example of carbon. The atomic number of carbon is 6 and it contains two electrons in 2p subsheIl and these can be distributed in the following three ways.

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