Which among the following does not exist?

Despite the fact that $\mathrm{Xe}$ and Ne are both inert gases, $\mathrm{Xe}$ can combine with oxygen and fluorine due to its size. $\mathrm{Ne}$ is more compact and more inert; therefore, it only exists in atomic form and cannot combine to create molecules with other atoms.

Hence, ${\mathrm{NeF}}_2$ does not exist.