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easyMCQAIEEE 20062026Chemistry
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Lanthanoid contraction is caused due to:

  1. A
    the appreciable shielding on outer electrons by electrons from the nuclear charge
  2. B
    the appreciable shielding on outer electrons by electrons from the nuclear charge
  3. C
    the same effective nuclear charge from to
  4. D
    the imperfect shielding on outer electrons by electrons from the nuclear charge

Solution & Step-by-step Explanation

electrons have poor shielding effects due to their diffuse shape. As we move across the Lanthanoid series, the nuclear charge increases, but the electrons being added do not effectively shield the outer electrons. This results in an increase in effective nuclear charge, causing the atomic and ionic radii to shrink gradually.

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Lanthanoid contraction is caused due to:
A
the appreciable shielding on outer electrons by electrons from the nuclear charge
B
the appreciable shielding on outer electrons by electrons from the nuclear charge
C
the same effective nuclear charge from to
D
the imperfect shielding on outer electrons by electrons from the nuclear charge

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