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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
In a given atom no two electrons can have the same values for all the four quantum numbers. This is called
  • A
    Hund's rule
  • B
    Aufbau's principle
  • C
    Uncertainty principle
  • ✓
    Pauli's exclusion principle
✓

Answer

Correct option: D.
Pauli's exclusion principle
d
Hund's rule of maximum multiplicity states that for a given electron configuration, the lowest energy term is the one with the greatest value of spin multiplicity. This implies that if two or more orbitals of equal energy are available, electrons will occupy them singly before filling them in pairs. The Pauli Exclusion Principle states that, in an atom or molecule, no two electrons can have the same four electronic quantum numbers. As an orbital can contain a maximum of only two electrons, the two electrons must have opposing spins.

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