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JEE Main2005Chemistryd and f Block ElementsActual

Which of the following factors may be regarded as the main cause of lanthanide contraction?

Options

  1. APoor shielding of one of 4f electron by another in the subshell
  2. BPoor shielding of one of 4f electron by another in the subshell
  3. CPoorer shielding of 5d electrons by 4f electrons
  4. DGreater shielding of 5d electrons by 4f electrons

Correct answer

A. Poor shielding of one of 4f electron by another in the subshell

Step-by-step solution

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