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碘(粵拼:din2,Iodine)係元素一種,符號I,原子序號53,原子重量126.90447(3)。廣東話文讀『典』,不過有時就讀『甸』,讀法來英文Iodine尾音。碘係多數生物重要嘅微量元素。化學上,佢喺鹵素之中最唔活躍。碘主要係用響醫學、攝影同埋染料之上。同其他鹵素一樣,純碘多數係以雙原子分子出現。
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