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Britannica Sources used in this answer

How many iodine atoms are in a thyroxine molecule?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
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

A molecule of thyroxine contains four iodine atoms. These atoms are incorporated into the hormone during its synthesis from the amino acid tyrosine within the thyroid gland.12