Indium
Other oxidation states

Less frequently, indium forms compounds in oxidation state +2 and even fractional oxidation states. Usually such materials feature In–In bonding, most notably in the halides In X and, and various subchalcogenides such as In Se. Several other compounds are known to combine indium(I) and indium(III), such as In (In Cl)Cl, In (In Br) (In Br), and In In Br.
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