Xenon trioxide XeO₃

Fluorine is the ONLY ELEMENT that directly reacts with Xenon. So how do we get XeO₃? Xenon Halides are reactive with other compounds such as water.

The Xe has a total of 8 outside shell electrons while the Fluorine 7 valence electrons. Xe's outside shell electrons are very far away from the center, therefore Xenon cannot possibly pay attention/attract all of the electrons. Fluorine is smaller, therefore is has a stronger positive attraction to the few electrons it has left. Fluorine is the only element that reacts with Xe because it is the most electronegative. In other words, it is the only element that is strong enough to pull electrons out of the stable xenon.