“All the four quantum numbers of two electrons in an atom are not the same.” It is the law of

“All the four quantum numbers of two electrons in an atom are not the same.” It is the law of — 

(1) Hund’s 

(2) Exclusion Principle of Pauli 

(3) Uncertainty Principle of Heisenberg 

(4) Avogadro’s Law 


Answer: (2) The Pauli exclusion principle is the quantum mechanical principle that no two identical fermions (particles with half-integer spin) may occupy the same quantum state simultaneously. A more rigorous statement is that the total wave function for two identical fermions is anti-symmetric with respect to the exchange of the particles. For example, no two electrons in a single atom can have the same four quantum numbers; if n, l, and ml are the same, ms must be different such that the electrons have opposite spins. 

“All the four quantum numbers of two electrons in an atom are not the same.” It is the law of —   (1) Hund’s   (2) Exclusion Principle of Pauli   (3) Uncertainty Principle of Heisenberg   (4) Avogadro’s Law


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