Iodine is one of the halogen gases along with chlorine, fluorine, astatine and bromine. Iodine is the heaviest and it is #53 on the periodic table. In regular conditions it appears purple-black in color. It's melting point is 386.85 K. It's
boiling point is 457.4 K. And it was discovered in 1811. It is an important micro-nutrient in the human diet and is readily available in seaweeds.
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