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Sodium Iodide is a salt of the highly reactive metal Sodium (Na) and the equally reactive halogen gas, Iodine (I). Because Sodium has a valence of +1 (an electron to spare in its outer shell) and Iodine a valence of -1 (an electron short in its outer shell), the two react one to one. The formula therefore is NaI.

Sodium forms salts with all the halogen gases including Chlorine the result of which is standard table salt, NaCl.

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