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iodine: Quick Facts

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Facts

Also Known As I

Photos and Videos

A labeled diagram highlights the periodic table entry for iodine, atomic number 53, symbol I, atomic weight 126.90447, and electron configuration. It shows iodine as a solid halogen with an orthorhombic crystal structure and strongly acidic higher-valence oxides, using color and shape keys for classification.
iodine
iodine
Two beakers show iodine dissolving in different solvents: on the left, iodine does not dissolve in water; on the right, iodine dissolves and turns purple in a benzene solution. Molecular models are shown above each beaker.
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Key People

default image
Bernard Courtois
French chemist
Joseph-Louis Gay-Lussac, engraving by Ambroise Tardieu.
Joseph-Louis Gay-Lussac
French scientist
Sir Humphry Davy
Sir Humphry Davy
English chemist
ean-Baptiste-André Dumas
Jean-Baptiste-André Dumas
French chemist
Viktor Meyer
Viktor Meyer
German chemist

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