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has·si·um AHD[häʹsē-əm] D.J.[ˈhɑːsiːəm]K.K.[ˈhɑsiəm]n.Symbol Hs （名词）符号 Hs - An artificially produced radioactive element with atomic number 108 whose most long-lived isotopes have mass numbers of 264 and 265 with half-lives of 0.08 milliseconds and 2 milliseconds, respectively. Also called unniloctium ：人造放射性元素，原子序数号为108，生命期最长同位素的质量为264和265，半衰期分别为0.08毫秒和2毫秒 也作 unniloctium
- From Medieval Latin Hassia [Hesse (German state containing Darmstadt, where the element was first synthesized)] From Medieval Latin Hassia [Hesse (German state containing Darmstadt, where the element was first synthesized)]
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