Hund's Rule, Pauli Exclusion Principle, and the Aufbau Principle - Practice Questions & MCQ
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Aufbau Principle, Pauli Exclusion Principle and Hund's Rule of Maximum Multiplicity is considered one of the most asked concept.
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20 Questions around this concept.
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EASYWhich of the following is correct order of filling of electrons in a species having more than one electron
Which of the following sets violate Pauli's exclusion principle :
Which of the following sets violate the Hund's rule
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The incorrect order of energy of following orbitals is
Which of the following options does not represent ground state electronic configuration of an atom?
If the Aufbau principle is not followed, the first three quantum numbers (n, l and m) for the valence electron of K atom may take value
Concepts Covered - 1
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.
- The orbitals having lower value of (n+l), has lower energy.
- If value of (n+l) is same for two orbitals, then orbital with lower value of ‘n’ would have lower energy and filled first.
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 numbers" .
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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