regarding the element that we were talking about earlier, could you tell me who discovered it?
Bernard Courtois
Iodine
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 Greek "ἰώδης" "violet-coloured".
where is iodine found on the periodic table In the Halogen group what are some of its uses? Elemental iodine is used as a disinfectant; iodine compounds are used as catalysts, animal feed supplements, stabilisers, dyes, colourants etc. can it be poisonous? Yes - Elemental iodine is toxic if taken orally undiluted. The lethal dose for an adult human is 30 mg/kg, which is about 2.1–2.4 grams for a human weighing 70 to 80 kg is it an important component for a humans healthy life? Yes -  It is required for the synthesis of the growth-regulating thyroid hormones thyroxine and triiodothyronine can you tell me more about the hormone you just mentioned? The thyroid gland secretes three hormones: the two thyroid hormones – triiodothyronine (T) and thyroxine (T) – and a peptide hormone, calcitonin. The thyroid hormones influence the metabolic rate and protein synthesis, and in children, growth and development.
wiki:7685898
Iodine [SEP] Introduction
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. However, it sublimes easily with gentle heat, resulting in a widespread misconception even taught in some science textbooks that it does not melt. 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 Greek "ἰώδης" "violet-coloured".