Which Element Loses An Electron Most Readily Sodium,neon,fluorine Or Oxygen?

Sodium atom loses an electron readily because it has only one electron in its valence shell. Sodium atom with one electron in its valence shell is unstable. When it loses one electron, its outer most shell completes. Neon is a noble gas so, the valence shell of neon is completed. It is very difficult to remove electron from its valence shell. Oxygen has six electrons and fluorine has seven electrons in outer most shell. Oxygen and fluorine gain two and one electron respectively to become stable. Moreover, oxygen and fluorine atoms have ability to gain electrons.