A chemical element essential for thyroid function, appearing as dark purple crystals that produce violet vapor when heated. Used medically as an antiseptic and in photography.
From French 'iode' (1812), coined by chemist Gay-Lussac from Greek 'iodes' meaning 'violet-like,' referring to the color of its vapor. The element was discovered in 1811 by Bernard Courtois while processing seaweed ash.
Iodine is the only halogen that's visible to the naked eye as a solid, and its deficiency affects more people worldwide than any other micronutrient deficiency. The purple vapor it produces was actually the first clue to its discovery - Courtois noticed the strange colored gas while cleaning his equipment.
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