Which from following elements is NOT radioactive?

Which from following elements is NOT radioactive?
  1. $\mathrm{At}$
  2. $\mathrm{Po}$
  3. $\mathrm{Rn}$
  4. $\mathrm{Ar}$

Solution

Argon is not radioactive, while the other three atoms are: Argon: An inert gas that is not radioactive Polonium: A radioactive element with the atomic number 84 and the most stable isotope Po-209 Radon: A colorless, odorless, radioactive gas.

Asked in: MHT CET 2023 (12 May Shift 1)

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