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AP EAMCET202123 Aug 2021Evening ShiftChemistryStructure of AtomActual

In f -block elements, orbitals are progressively filled by the electrons.

Options

  1. A3 f and 4 f
  2. B4 f and 5 f
  3. C5 f and 6 f
  4. D6 f and 7 f

Correct answer

B. 4 f and 5 f

Step-by-step solution

The general electronic configuration of f -block elements is (n-2) f^ (0-14) (n-1) d^ (0-1) n s^2 General electronic configuration of lanthanoids is [Xe] 4 f¹⁻¹⁴ 5 d⁰⁻¹ 6 s^2 and actinoides is [ Rn ] 5 f¹⁻¹⁴ 6 d⁰⁻¹ 7 s^2 So, 4 f and 5 f orbitals are filled in f -block elements.

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