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NEETChemistryd and f Block Elements

How do the atomic radii change as the 4f orbitals are filled before the 5d series begins?

Options

  1. AThe atomic radii increase.
  2. BThe atomic radii decrease.
  3. CThe atomic radii remain the same.
  4. DThe atomic radii vary unpredictably.

Correct answer

C. The atomic radii remain the same.

Step-by-step solution

The atomic radii remain virtually the same as the 4f orbitals are filled before the 5d series begins.

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