francium oxide [无化] 氧化钫
francium isotope [核] 钫同位素
eka francium 类钫
francium compound [无化] 钫化合物
Francium Carbide 钫碳化物
francium compounds 钫化合物
Isotopes of francium 钫的同位素
同义词： Fr atomic number 87
以上来源于: WordNet
N an unstable radioactive element of the alkali-metal group, occurring in minute amounts in uranium ores. Symbol: Fr; atomic no: 87; half-life of most stable isotope, 223Fr: 22 minutes; valency: 1; melting pt: 27°C; boiling pt: 677°C 钫
Francium is the densest of the Alkali Metals and also radioactive.
钫是碱金属中密度最大的，具有放射性。
Even Francium's most stable isotope, Francium-223 only has a half-life of 22 minutes.
钫的最稳定的同位素，钫- 223也只有22分钟的半衰期。
Because Francium is mainly only found synthetically in laboratory research, it has no known use outside of the laboratory.
由于钫主要仅在实验室研究中产生，它在实验室外没有已知的用途。
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