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State Hund's rule and Aufbau principle....

State Hund's rule and Aufbau principle.

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Hund.s rule: Pairing up of electrons takes place only when all the available degenerate orbitals in a given sub shell are filled with one electron each.
Aufbour principle: In the ground state of the atoms,
The orbitals are filled up with electrons in the increasing order of their energy.
The relative order of energy of various orbitals is
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