francium

名词 francium:

1. a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
   同义词：Fr, atomic number 87

fran.ci.um

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 9 isotopes, the most stable of which is Fr 223 with a half-life of 2 minutes. Atomic number 87; valence .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9种同位素，其中最稳定的是半衰期为2分钟的Fr223。原子序数为87；化合价为参见 element

来源：
After France
源自 France