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NEETChemistryd and f Block Elements

Why is there a regular decrease in the size of the entire 4f orbitals as the nuclear charge increases along the series?

Options

  1. ADue to the decrease in metallic radius.
  2. BDue to the filling of 5d orbitals.
  3. CDue to the imperfect shielding of one 4f electron by another.
  4. DDue to the intervention of the 4f orbitals.

Correct answer

C. Due to 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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