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NEETChemistryd and f Block Elements

What is the reason for the regular decrease in the size of the entire 4f orbitals as the nuclear charge increases along the series?

Options

  1. AThe decrease in metallic radius.
  2. BThe filling of 5d orbitals before 4f orbitals.
  3. CThe imperfect shielding of one 4f electron by another.
  4. DThe intervention of the 4f orbitals.

Correct answer

C. The imperfect shielding of one 4f electron by another.

Step-by-step solution

The regular decrease in the size of the entire 4f orbitals is due to the imperfect shielding of one 4f electron by another.

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