How can Xenon and Krypton form compounds with Fluorine if they are inert gases?

1 Answer

Because #"inert gas"# is a misnomer.


The #"Noble Gases"# have a full valence electron shell, and they rarely form compounds with other elements.

However, with highly reactive elements, and fluorine and oxygen are the most reactive elements, a few of the #"Noble Gases"# can form isolable compounds, since their valence orbitals stick out far enough from the nucleus to allow sufficient reactivity.