Fluorine has nine protons, nine electrons and 10 neutrons. The number of protons and electrons within an atom are always equivalent when an atom is in a stable state. The negatively charged electrons balance out the positively charged protons, rendering the atom electrically neutral.
Fluorine is the most reactive non-metallic element found in nature and is one of the five halogens, a group of highly active non-metallic elements. Owing to its chemically reactive nature, fluorine is not an independently occurring element; it needs to be extracted from a naturally occurring compound containing other elements. Fluorine is most commonly derived from the minerals fluorite, apatite and cryolite.