The fluorine atom has 7 valence electrons. This is because fluorine is in Group 17 (also called 7A) of the periodic table, and elements in this group have 7 electrons in their outermost shell. The electronic configuration of fluorine is 1s22s22p51s^22s^22p^51s22s22p5, with the 7 valence electrons being the 2 electrons in the 2s orbital and 5 electrons in the 2p orbital. Fluorine needs one more electron to complete its octet, which contributes to its high reactivity.
