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Iodide ion

I−I^-

Charge: 1- · Type: Anion · Molar mass: 126.90 g/mol

Made of: iodine

How it forms

Iodine accepts one electron from metals to complete its outer shell, forming I-. The ion is a mild reducing agent: it is easily oxidized back to iodine, which is why iodide solutions turn brown in air over time.

Naming note

I- is the iodide ion. Iodized salt contains iodide (or iodate), not elemental iodine.

Examples in compounds

  • Potassium iodide

  • Sodium iodide

  • Silver iodide

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