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Question

What is Hund's rule of multiplicity?


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Solution

Hund's rule of multiplicity

  • This rule states that the “pairing of electrons in the orbitals belonging to the same subshell (p, d or f) does not take place until each orbital belonging to that subshell has got one electron each i.e., it is singly occupied.”

Example

  • In the case of p-subshell(which consists of 3 orbitals ), pairing occurs with the entry of the 4th electron.
  • In the case of the d-subshell(which consists of 5 orbitals), pairing occurs with the entry of the 6th electron.
  • In the case of f -subshell(which consists of 7 orbital), pairing occurs with the entry of the 8th electron.

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