Iodine is a chemical element with
the symbol I and atomic number 53. The heaviest of the stable halogens, it
exists as a lustrous, purple-black non-metallic solid at standard conditions
that melts to form a deep violet liquid at 114 degrees Celsius, and boils to a
violet gas at 184 degrees Celsius. The element was discovered by the French
chemist Bernard Courtois in 1811. It was named two years later by Joseph Louis
Gay-Lussac from this property, after the Greek ἰώδης
"violet-coloured".
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