Q. In which among the following categories, Radon (Rn) can be placed? Radioactive Element Inert Gas Noble Gas Choose the correct option:
Answer: 1, 2 & 3
Notes: Radon (Rn) is:

1. A radioactive element - Correct. Radon is radioactive and decays into other elements by emitting radiation.
2. An inert gas - Correct. Radon is a noble gas and noble gases are chemically inert under most conditions.
3. A noble gas - Correct. Radon is considered a noble gas, along with helium, neon, argon, krypton, xenon and oganesson. Noble gases tend to have low chemical reactivity.

So Radon fits into all three categories - it is a radioactive element, an inert gas, and a noble gas. The correct option is therefore D) 1, 2 & 3

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