Answer the following question given this paragraph: 

Because radon is a noble gas, it is inert and generally unreactive. Despite this, exposure to even low concentrations of radon in air is quite dangerous. Describe the physical consequences of exposure to radon gas. Why are people who smoke more susceptible to these effects?.


Q: Radon is inert and generally unreactive because it is which kind of gas?

 Choices:

- ignoble gas

- transitive gas

- ideal gas

- noble gas

A:
noble gas
