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NEET 2022
Exam
NEET
Year
2022
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2022 · Chemistry · d and f Block Elements

Decrease in size from left to right in actinoid series is greater...

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

Options

  1. A4f4 f orbitals are penultimate
  2. B4f4 f orbitals have greater shielding effect
  3. C5f5 f orbitals have poor shielding effect
  4. D5f5 \mathrm{f} orbitals have greater shielding effect

Correct answer

C. 5f5 f orbitals have poor shielding effect

Step-by-step solution

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