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    Ar

    元素符號:Ar

    中文名稱:氬

    英文名稱:Argon

    原子序數:18

    原子量:39.95

    外圍電子排布:3s2 3p6

    核外電子排布:2,8,8

    常見化合價:0

    密度:0.0017824

    溶點:-189.2

    沸點:-185.7

    所屬週期:3

    所屬族數:0

    原子半徑:0.88

    離子半徑:

    共價半徑:0.98

    同位素及放射性:Ar-36 Ar-38 *Ar-40

    發現人:Sir William Ramsey, Baron Rayleigh

    發現時間:1894

    發現地點:蘇格蘭

    名稱由來:Greek: argos (inactive).

    元素描述:Colorless, odorless, tasteless noble gas. It is the third most abundant element in the earth"s atmosphere and makes up about 1%.

    元素來源:Continuously released into the air by decay of radioactive potassium-40. Pure form is obtained from fractional distillation of liquid air.

    元素用途:Used in lighting products. It is often used in filling incandescent light bulbs. Some is mixed with krypton in fluorescent lamps. Crystals in the semiconductor industry are grown in argon atmospheres.

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