The atomic number of fluorine is 9 and the atomic number of Neon is 10. Fluorine is present in group 7 while Neon is present in group 8. In fluorine, the 2p orbital occupies only 5 electrons while in Neon, the 2p orbital is entirely filled. Fluorine and neon exist in the same series element. In fluorine, the nuclear charge is high, which makes its size smaller than its next inert gas configuration.

Thus, the Atomic radii of fluorine and neon in the angstrom unit are 0.75 and 1.6 respectively.