AP EAMCET · Chemistry · d and f Block Elements
Which of the following set of elements do not possess \(f\)-electrons?
- A La, U, Lr
- B La, Th, Lr
- C La, Ac, Th
- D Ce, Ac, Th
Answer & Solution
Correct Answer
(C) La, Ac, Th
Step-by-step Solution
Detailed explanation
Electronic configurations of (i) Lanthanum (La) with \((Z=57)\) is \[ [\mathrm{Xe}]_{54} \cdot 5 d^1 \cdot 6 s^2 \] (ii) Uranium (U) with \((Z=92)\) is \[ [\mathrm{Rn}]_{86} \cdot 5 f^3 \cdot 6 d^1 \cdot 7 s^2 \] (iii) Lawrencium ( \(\operatorname{Lr})\) with \((Z=103)\) is…
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