JEE Main & Advanced Sample Paper JEE Main Sample Paper-27

  • question_answer
    The lanthanides contraction refers to:

    A)  ionic radius of the series.

    B)  valence electrons of the series.

    C)  the density of the series.

    D)  electronegativity of the series.

    Correct Answer: A

    Solution :

    Due to 4f-orbital electrons (poor shielding effect) there is increase in effective nuclear charge which leads to the contraction of the size of atoms. This is called lanthanide contraction.


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