why is hund's rule called hund's rule of MAXIMUM MULTIPLICITY?
what is meant my MAXIMUM MULTIPLICITY?

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Solution

Hund’s Rule of Maximum Multiplicity
Pairing of electrons in the orbitals belonging to the same sub-shell (p, d, or f) does not take place until each orbital belonging to that sub-shell has got one electron each (i.e., singly occupied).
Orbitals of equal energy (i.e., same sub-shell) are called degenerate orbitals.

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Can Hund's rule of maximum multiplicity be also called Hund's rule of maximum spin multiplicity ?

p^{3}

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B

1 s^{2} 2 s^{2}

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