Question

Can we define the atomic radius of a radioactive element

Answer 1

No we can not define the atomic radius of a radioactive element because it changes with time in many elements in the end it becomes in a stable element so we can not calculate it.
Hope it will help you

Answer 2

Explanation:

Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles or photons.