Atomic radii of fluorine and neon $\left({\mathrm{A}}^{\mathrm{o}}\right)$ respectively  are given as

F and Ne belong to the same 2nd period. Size of inert gases is slightly greater than the preceding halogens, due to repulsion between paired electrons $\left({\mathrm{ns}}^2{\mathrm{np}}^6\right).$

$\therefore \mathrm{Size}\mathrm{of}\mathrm{Ne}>\mathrm{size}\mathrm{of}\mathrm{F}\left(1.60{\mathrm{A}}^0>0.72{\mathrm{A}}^0\right)$