# How many unpaired electrons are in a radon atom?

There are no unpaired electrons in a radon atom or any atom of the noble gases. The atomic number of radon is $76$, which means that a neutral atom would also contain $76$ electrons.
The noble gas shorthand electron configuration is ["Xe"]4"f"^14"5d"^10"6s"^2"6p"^6". All of the energy sublevels are filled to the point of $\text{6s"^2"6p"^6}$.