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Iodine is a chemical element with symbol I and atomic number 53. Under standard conditions, iodine is a bluish-black solid with a metallic lustre, appearing to sublimate into a noxious violet-pink gas, the color due to absorption of visible light by electronic transitions between the highest occupied and lowest unoccupied molecular orbitals. Melting point is at 113.7 °C (236.7 °F).