Fluorine in its elemental state has nine electrons, equal to the amount of protons that it has. Fluorine is often found as a negative ion, which means the fluorine atom has gained electrons equal to the amount of negative charge it holds.
Any element on the periodic table will have an amount of electrons equal to its number on the table. It will also have the same amount of protons as electrons. The table also specifies the atomic weight of an element, which can be used to find the number of neutrons an atom contains. The number of neutrons is determined by subtracting the atomic number from the atomic mass.