Question

Radon gas is known as a potential carcinogen that often builds up in basements. Radon-222 emits alpha particles that can damage lung tissue when inhaled. Which of the following is the most accurate equation showing the alpha decay of Rn-222?

A) 222⁸⁶ Rn -> 0⁻¹Fr + 222⁸⁷

B) 222⁸⁶ Rn -> 4² He + 226⁸⁸ Ra

C) 222⁸⁶ Rn -> 218⁸⁴Po + 2⁴ He

D) 222⁸⁶ Rn -> 224⁹⁰Th + 2⁴ He

Answer 1

The accurate alpha decay equation for radon-222 is option C, wherein radon-222 decays into polonium-218 and a helium-4 nucleus.

Step-by-step explanation:

The most accurate equation showing the alpha decay of Rn-222 is C) 222⁸⁶Rn -> 218⁸⁴Po + 4²He. The equation represents the decay of radon-222, an alpha (a) emitter, into polonium-218 and an alpha particle (which is the same as a helium-4 nucleus). The process of alpha decay reduces the original atom's mass number by 4 and atomic number by 2, hence transforming radon (Rn) into polonium (Po), as indicated in option C.