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Elements and Compounds

What element is similar to iodine?

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May 11, 2015 11:44AM

In general, elements are most similar to their immediate neighbors in a column of the periodic table. This means that iodine is most like bromine and/or astatine. Chemically speaking, it is bromine that is most like iodine. Iodine is a halogen (the Group 17 elements), and it lacks one electron from having a full outer shell like all elements of its group. Under that heading, fluorine, chlorine, bromine or astatine might be cited as similar, and this would be generally correct. But though the halogens in general are pretty darn reactive, iodine is the least reactive of them. And it is bromine that is closest in electronegativity (which is kind of like "reactivity") to iodine, so it's chemically most similar. Links to related Wikipedia posts are provided and can be found below.