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NEET2022Chemistryd and f Block ElementsActual

Decrease in size from left to right in actinoid series is greater and gradual than that in lanthanoid series due to:

Options

  1. A4 f orbitals are penultimate
  2. B4 f orbitals have greater shielding effect
  3. C5 f orbitals have poor shielding effect
  4. D5 f orbitals have greater shielding effect

Correct answer

C. 5 f orbitals have poor shielding effect

Step-by-step solution

More is the number of poor shielders, greater will be Z _ eff and hence, smaller is the size. Actinoids consists of more no. of poor shielders (3 d, 4 d, 5 d, 4 f) . Therefore, size continuously decreases left to right.

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