The 'f' orbitals are half and completely filled, respectively in lanthanide ions. [Given: Atomic No. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]

Question

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Need: half-filled () and completely filled () lanthanide ions.

Checking each option:

Option (4):  and

- Dy (Z=66):  → : remove  and one  →  ✗

Option (3):  and 
- Tb (Z=65):  → : remove  + 2 from  →  ✓ (half-filled)
- Yb (Z=70):  → : remove  →  ✓ (completely filled)

Option (3) is correct:  (, half-filled) and  (, completely filled).

Answer: Option (4) —  and

Note: Checking Dy³⁺: Dy(Z=66) = [Xe] 4f¹⁰ 6s² → Dy³⁺ removes 6s² and one 4f → 4f⁹. Yb(Z=70) = [Xe] 4f¹⁴ 6s² → Yb³⁺ removes 6s² and

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