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JEE Main2006Chemistryd and f Block ElementsActual

Lanthanoid contraction is caused due to

Options

  1. Athe appreciable shielding on outer electrons by 4f electrons from the nuclear charge
  2. Bthe appreciable shielding on outer electrons by 5d electrons from the nuclear charge
  3. Cthe same effective nuclear charge from Ce to Lu
  4. Dthe imperfect shielding on outer electrons by 4f electrons from the nuclear charge

Correct answer

D. the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

Step-by-step solution

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