Radon decays into how many short-lived decay products?

Radon primarily decays into four short-lived decay products through its radioactive decay process. When radon-222, the most prevalent isotope of radon, undergoes decay, it produces a series of decay products, which are polonium-218, lead-214, bismuth-214, and polonium-214. Each of these decay products has a relatively short half-life, contributing to their classification as short-lived.

These decay products are significant in the context of radon exposure because they can attach to airborne particles, becoming inhaled into the lungs, where they can continue to decay and potentially increase the risk of lung cancer. Understanding the decay sequence and the number of radioactive progeny helps in assessing the health risks associated with radon in indoor environments.

The other choices refer to incorrect counts of the radon decay products. Hence, the correct answer is supported by the knowledge of radon’s decay chain and the specific nature of its short-lived decay products.