英语词汇“francium”是什么意思，“francium”的读音、用法及例句翻译-烛光网

词汇	francium
释义	fran·ci·um AHD[frănʹsē-əm] D.J.[ˈfrænsiːəm]K.K.[ˈfrænsiəm]n.Symbol Fr （名词）符号 Fr An extremely unstable radioactive element of the alkali metals, produced artificially from actinum or thorium, having approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87; valence 1. See table at element 钫：从碱金属锕或钍中人工提炼出的一种极不稳定的放射线元素，约有19种同位素，其中最稳定的是半衰期为21分钟的Fr223。原子序数为87；化合价为1 参见 element Etymology语源 After France 源自 France
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