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CMC Medical CMC-Medical Ludhiana Solved Paper-2008

  • question_answer
    In a given atom no two electrons can have the same values for all the four quantum numbers. This is called

    A) Hunds rule

    B) Aufbaus principle

    C) Uncertainty principle

    D) Paulis exclusion principle

    Correct Answer: D

    Solution :

    Paulis exclusion principle No two electrons in an atom can have same value of all the four quantum numbers \[eg,\,1{{s}^{2}}\] For 1st electron; \[n=1,\]\[l=0,\]\[m=0,\]\[s=+\frac{1}{2}\] For 2nd electron; \[n=1,\]\[l=0,\]\[m=0,\]\[s=-\frac{1}{2}\]


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