Why does neon have a higher second ionization energy than fluorine?

Neon has a higher second ionization energy than fluorine because its first ionization energy removes an electron from a stable noble gas configuration, resulting in a very stable ion. In contrast, fluorine's second ionization energy involves removing an electron from a more unstable anion (F⁻), which is easier than removing a second electron from neon's filled outer shell. Additionally, the effective nuclear charge experienced by the remaining electrons in neon is higher, making it more difficult to remove the second electron compared to fluorine.