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

Because $\text{inert gas}$ is a misnomer.
The $\text{Noble Gases}$ 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 $\text{Noble Gases}$ can form isolable compounds, since their valence orbitals stick out far enough from the nucleus to allow sufficient reactivity.