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Britannica Sources used in this answer

Which naturally occurring isotope of iodine is stable?

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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

The only naturally occurring isotope of iodine is the stable iodine-127.1