JEE Main & Advanced Sample Paper JEE Main Sample Paper-4

  • question_answer
    The first ionization potential of Na, Mg, Al and Si are in the order

    A) \[Na<Mg>Al<Si\]            

    B) \[Na>Mg>Al>Si\]

    C) \[Na<Mg<Al>Si\]            

    D) \[Na>Mg>Al<Si\]

    Correct Answer: A

    Solution :

    Ionisation energy increases from left to right in a period. However, exception occur between group - 2 and group -13 elements on account of stability of electronic configuration of valence shell. \[\Rightarrow \]The desired order is : \[Na<Mg>Al<Sl\]

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