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State PCS PYQPrelims 2023

UPPCS · Question 79

Which of the following elements is NOT a noble gas?

  1. Radon
  2. Krypton
  3. Argon
  4. Actinium
Show answer & explanation

Answer: (D) Actinium

Explanation

Actinium is an actinide metal; radon, krypton and argon are Group 18 noble gases.