Lesson eLearning

Which element belongs to the f‑block of the periodic table?

easy MCQ 2 marks Class 12 · Chemistry · d- and f-Block Elements
  1. A) Lanthanum
  2. B) Ytterbium
  3. C) Chromium
  4. D) Copper
Answer
B) Ytterbium

The correct answer is B) Ytterbium — Ytterbium has [Xe]4f^14 6s^2 – 4f electrons present – f‑block.

Step-by-step solution

  1. Identify that f‑block elements have 4f electrons in their ground‑state configuration.
  2. Check each option: Lanthanum has configuration [Xe]4f^0 5d^1 6s^2 – no 4f electrons, so not f‑block.
  3. Chromium has 3d^5 4s^1 – d‑block.
  4. Copper has 3d^10 4s^1 – d‑block.
  5. Ytterbium has [Xe]4f^14 6s^2 – 4f electrons present – f‑block.
Common mistake: Confusing Lanthanum (which is in d‑block) as f‑block

Concept tested: Identification of f‑block elements

Published · How this solution was prepared and checked

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