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Aufbau Principle, Pauli Exclusion Principle and Hund’s Rule of Maximum Multiplicity is considered one of the most asked concept.
18 Questions around this concept.
If n=6, the correct sequence for filling of electrons will be:
Aufbau Principle -
According to this rule, “orbitals are filled in the increasing order of their energies starting with the orbital of lowest energy”.
Energy of various orbitals are compared with (n+l) rule.
For eg: 3p and 3d.
For 3p : n=3, l=1 so n+l= 4 For 3d : n=3, l=2 so n+l=5
Thus energy of 3p is lower than that of 3d.
Pauli Exclusion Principle -
“No two electrons in an atom can have the same set of four quantum number" .
Hund’s Rule of Maximum Multiplicity -
"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.”
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