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  9. Q80

UPPSC PCS 2023 · Question 80 of 150

Which of the following elements is not a Noble gas?

General Knowledge

  1. AArgon
  2. BActiniumCorrect
  3. CKrypton
  4. DRadon

Answer: B. Actinium

Explanation

Actinium is the first element of the actinide series. All 36 known isotopes of actinium are radioactive.

Source: edurev.in solved-paper compilation (OSWAAL 15-Years UPPSC Prelims Solved Paper)

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