francium的英语例句
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The half - life of francium is 22 minutes.
钫的半衰期是22分钟.
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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.
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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.
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