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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 10

  • question_answer
    \[Ga\] is below \[Al\] in the periodic table, but atomic radius of \[Ga\] is less than\[Al\]. It is because of

    A) Lanthanoid contraction

    B) Greater screening effect

    C) Inert pair effect       

    D) None of these

    Correct Answer: B

    Solution :

    The atomic radius of \[Ga\] is slightly less than that of \[Al\] because in going from \[Al\] to \[Ga,\] the electrons have already occupied 3d sub shell in \[Ga,\] The screening effect of these intervening electrons being poor and has less influence to decrease the effective nuclear charge, therefore the electrons in \[Ga\] experiencess more forces of attraction towards nucleus to result in lower size of \[Ga\] than \[Al\].


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