| 释义 |
as·ta·tine AHD[ăsʹtə-tēn', -tĭn] D.J.[ˈæstəˌtiːn, -tɪn]K.K.[ˈæstəˌtin, -tɪn]n.Symbol At （名词）符号 At - A highly unstable radioactive element, the heaviest of the halogen series, that resembles iodine in solution. Its longest lived isotope has a mass number of 210 and has a half-life of 8.3 hours. Atomic number 85; melting point 302°C; boiling point 337°C; valence probably 1, 3, 5, 7. See table at element 砹：极不稳定放射性元素，在卤族元素比重最大，在溶解状态与碘相象，它最长周期的同位素原子量为210，半衰期为8.3小时。原子序数85；溶点302°C；沸点337°C；化合价可能为1、3、5、7 参见 element
- Greek astatos [unstable] * see astasia 希腊语 astatos [不稳定的] * 参见 astasia
- -ine 2-ine2
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