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  2. Bernard Courtois

    Bernard Courtois, a French chemist, accidentally discovered iodine in 1811 during the Napoleonic Wars. Courtois was helping his father manufacture saltpeter — an important component in gunpowder that was in heavy demand at the time. Initially, he had been using wood ash as the source of potassium nitrate needed to make the saltpeter.
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    www.livescience.com/37441-iodine.html
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    Iodine - Wikipedia

    The element was discovered by the French chemist Bernard Courtois in 1811 and was named two years later by Joseph Louis Gay-Lussac, after the Ancient Greek Ιώδης, meaning 'violet'. Iodine occurs in many oxidation states, including iodide (I − ), iodate ( IO−3 ), and the various periodate anions. See more

    Iodine is a chemical element; it has symbol I and atomic number 53. The heaviest of the stable halogens, it exists at standard conditions as a semi-lustrous, non-metallic solid that melts to form a deep violet liquid at 114 °C (237 °F), … See more

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    Iodine is the fourth halogen, being a member of group 17 in the periodic table, below fluorine, chlorine, and bromine; since astatine and tennessine are radioactive, iodine is … See more

    Iodine is the least abundant of the stable halogens, comprising only 0.46 parts per million of Earth's crustal rocks (compare: fluorine: 544 ppm, chlorine: 126 ppm, bromine: … See more

    Iodine is an essential element for life and, at atomic number Z = 53, is the heaviest element commonly needed by living organisms. ( See more

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    In 1811, iodine was discovered by French chemist Bernard Courtois, who was born to a family of manufacturers of saltpetre (an essential component of gunpowder). At the time of the See more

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    Iodine is quite reactive, but it is much less reactive than the other halogens. For example, while chlorine gas will halogenate carbon monoxide, nitric oxide, and sulfur dioxide (to phosgene, nitrosyl chloride, and sulfuryl chloride respectively), iodine … See more

    About half of all produced iodine goes into various organoiodine compounds, another 15% remains as the pure element, another 15% is used to form See more

     
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