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12th Class Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank 12th CBSE Chemistry The d-and f-Block Elements

  • question_answer
      What is lanthanoid contraction? What are the causes o lanthanoid contraction.

    Answer:

      The gradual decrease in atomic radii from lanthanum to lutetium due to poor shielding of electrons is called lanthanoid contraction. (i) poor shielding of -electron (ii) increased nuclear charge.


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