Before revision: Representative iodides CompoundFormulaAppearanceUse or occurrencePotassium iodide KI white crystals iodine component of iodized saltHydrogen iodide HI colourless gas strong mineral acidSilver iodide AgI yellow powder that darkens in light photoactive component of silver-based photographic filmThyroxine(3,5,3′,5′-tetraiodothyronine) C15H11I4NO4 pale yellow solid hormone essential for human health Natural occurrence Iodargyrite—natural, crystalline silver iodide—is the most common iodide mineral currently known.
After revision: Representative iodides CompoundFormulaAppearanceUse or occurrencePotassium iodide KI white crystals iodine component of iodized salt, protection of the thyroid gland during a radiation emergencyHydrogen iodide HI colourless gas strong mineral acidSilver iodide AgI yellow powder that darkens in light photoactive component of silver-based photographic filmThyroxine(3,5,3′,5′-tetraiodothyronine) C15H11I4NO4 pale yellow solid hormone essential for human health Natural occurrence Iodargyrite—natural, crystalline silver iodide—is the most common iodide mineral currently known.