Periodic Table of Elements: Iodine

Symbol: I Atomic number: 53 Atomic mass: 126.90447 u CAS ID: 7553-56-2 Electron configuration: [Kr] 4d¹⁰5s²5p⁵ Boiling point: 363.7°F (184.3°C) Valence: 7 valence electrons Iodine was discovered by the French chemist Barnard Courtois in 1811. Courtois was extracting sodium and potassium compounds from seaweed ash. Once these compounds were removed, he added sulfuric acid (H2SO4) to further process the ash.

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