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Fluorine is a chemical element with symbol F and atomic number 9 (Group 7). It is the lightest and most reactive Halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions.
Symbol: F Atomic number: 9 Atomic mass: 18.998403 u ± 5 × 10^-7 u Electron configuration: [He] 2s22p5 Melting point: -219.6 °C Discovered: 1886 Discoverer: Henri Moissan
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