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Fluorine is a chemical element; it has symbol F and atomic number 9. It is the lightest halogen [ note 1 ] and exists at standard conditions as pale yellow diatomic gas. Fluorine is extremely reactive as it reacts with all other elements except for the light inert gases .
Standard atomic weight A r °(F) 18.998 403 162 ... Fluorine-18 is the lightest unstable nuclide with equal odd numbers of protons and neutrons, having 9 of each.
Fluorine is the chemical element with atomic number 9. It occurs naturally in its only stable form 19 F. [ 39 ] Fluorine is a pale-yellow, diatomic gas under normal conditions and down to very low temperatures.
Atomicity is the total number of atoms present in a molecule ... while its atomic weight is 15.879; [4] therefore, its atomicity ... 9 Fluorine (F) 2 10 Neon (Ne) 1 ...
Fluorine is an extremely reactive chemical element with atomic number 9 (pictured in liquid form at a cryogenic temperature).A highly toxic pale yellow gas at standard conditions, it was first described in 1529 as its principal source fluorite, a mineral added as a flux for smelting, and named after the Latin verb fluo meaning "flow".
Fluorine, 9 F; Liquid fluorine (F 2 at extremely low temperature) Fluorine; ... {Infobox element/periodic table}} (extends period 8 when atomic number ≥ 119.
At 400 ppb, fluorine is estimated to be the 24th most common element in the universe. It is comparably rare for a light element (elements tend to be more common the lighter they are). All of the elements from atomic number 6 (carbon) to atomic number 12 (magnesium) are hundreds or thousands of times more common than fluorine except for 11 (sodium).
Fluorine has one stable and naturally occurring isotope, fluorine-19. However, there are trace amounts in nature of the radioactive isotope fluorine-23, which occurs via cluster decay of protactinium-231. A total of eighteen isotopes of fluorine have been discovered, with atomic masses ranging from 13 to 31.