Iodine is a single isotope with 74 neutrons.
Chemically Iodine is the second least reactive of the halogens, and the second most electropositive halogen. The element does not occur in the free state in nature. As with all other halogens, when freed from it's compound iodine forms diatomic molecules(I2)
It is rare in the solar system and in the earths crust, however it's very soluble in water and so the element is concentrated in seawater.
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