system
Given the following post, respond as if you're commenting on Reddit:
human
How can Radon be dangerous if it's a noble gas?

I understand that it can be broken down from different radioactive elements, but how come it's still radioactive once it's a noble gas? I thought noble gasses didn't react with anything?
gpt
There are two types of reactions at play here. Noble gases do not react *chemically*, that is to say that they don't easily form molecules with other atoms. On the other hand, radioactivity has to do with the stability of the atomic nucleus. The two don't have much to do with each other.

The radon atom has an unstable nucleus (so it's radioactive) but it's still "full up" on electrons (so it's a noble gas).