I
元素符号:I
中文名称:碘
英文名称:Iodine
原子序数:53
原子量:126.9
外围电子排布:5s2 5p5
核外电子排布:2,8,18,18,7
常见化合价:-1,+1,+3,+5,+7
密度:4.93
溶点:113.5
沸点:184.35
所属周期:5
所属族数:VIIA
原子半径:1.32
离子半径:2.20(-1)
共价半径:1.33
同位素及放射性:I-127
发现人:Bernard Courtois
发现时间:1811
发现地点:法国
名称由来:Greek: I鬳ides (violet colored).
元素描述:Shiny, black, non-metalic solid; as a gas it is violet and intensely irritating to the eyes, nose and throat.
元素来源:Occurs on land and in the sea in sodium and potassium compounds.
元素用途:Required in small amounts by humans. Once used as an antiseptic, but no longer due to its poisonous nature.