Question

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

Answer 1

Because `"inert gas"` is a misnomer.

Explanation:

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.