What compounds does radon form?

Radon is a noble or inert gas, and, as such, is resistant to compound formation. It can form radon difluoride, RnF2, and an oxide under certain circumstances, but it generally seeks to avoid any chemical bonding. Little is known about the fluoride and the oxide because radon is radioactive (meaning it's dangerous to work with), and the longest lived isotope, 222Rn, has a half-life of less than 4 days (meaning it's hard to "gather up a bit of radon" to study it). Need a link? You got it. Wikipedia has knowledge for free.