This one extra electron in the fluoride ion causes a -1 charge. A fluorine atom has 7 valence (outer-shell) electrons. If you consider fluoride ion then the charge is -1 because it has an extra electron. Element Fluorine (F), Group 17, Atomic Number 9, p-block, Mass 18.998. The noble gas closest to phosphorus (atomic number) is argon (atomic number). Fluorine or fluoride? Fluorine atom has no charge as the proton and neutron number are both 9. Metals, glass, ceramics, carbon, and water will burn with a bright flame in fluorine. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. What is the symbol and charge for an ion of fluorine that has 10 electrons? Fluorine is the most electronegative element. Fluorine has an atomic number of 9. Fluorine (9 F) has 17 known isotopes, with atomic masses ranging from 14 F to 31 F (with the exception of 30 F), and two isomers (18m F and 26m F). Because the atomic number of argon is a neutral atom of argon will have electrons. It is possible that fluorine can substitute for hydrogen in organic reactions. The symbol for a fluorine anion with a charge of is. The charge in the upper right hand corner of the element symbol is -1 for a fluorine ion. TRUTH . Why isn't it +1 or some other number? Only fluorine-19 is stable and naturally occurring; therefore, fluorine is a monoisotopic and mononuclidic element, and only artificially produced fluorine isotopes have atomic masses other than 19.. To fulfill the octet rule, it needs one more valence electron for a total of 8. A r = Relative atomic mass (Also known as Weight) Now you know that the ion most frequently formed by phosphorus has the same number of electrons as a neutral atom of argon. Fluorine has been known to form compounds with … Periodic Table of Elements Grouped by Charge, Atomic Number, Weight, Symbol, and Classification. All atoms are most stable when the s and p orbitals of their outer shell contain 2 and 6 electrons respectively (octet)