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NEETChemistryd and f Block Elements

What is the primary factor responsible for the similarity in physical and chemical properties between the second and third d series?

Options

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

Correct answer

A. The intervention of the 4f orbitals.

Step-by-step solution

The similarity in physical and chemical properties between the second and third d series is primarily due to the intervention of the 4f orbitals.

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