NEET Sample Paper NEET Sample Test Paper-13

  • question_answer
    Reason of lanthanide contraction is           

    A)  negligible screening effect of f-orbitals  

    B)  increasing nuclear charge

    C)  decreasing nuclear charge

    D)  decreasing screening effect

    Correct Answer: A

    Solution :

     On account of poor shielding effect of f-electrons, nucleus exerts a strong attraction as atomic number increases and thus size of atom decreases.


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