Sodium iodide
chemical compound
Sodium iodide is a chemical compound. It is composed of sodium and iodide ions. The chemical formula is NaI. It is a white crystalline solid. It is a weak reducing agent. When it is exposed to oxygen in the air, it turns yellow-brown. It does this because some of the iodide was oxidized to iodine. It is used to supply iodine to the human body.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Sodium_iodide.jpg/220px-Sodium_iodide.jpg)
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