a radioactive element of the alkali-metal group discovered as a disintegration product of actinium 同义词：Fr, atomic number 87,
Francium is a chemical element with symbol?Fr and atomic number?87. It was formerly known as eka-caesium and actinium K.
例句与用法
1.
The half-life of francium is 22 minutes . 钫的半衰期是22分钟。
2.
Eating the francium of us the meal place the one that turn on at foreigner , the things inside chinese goods , it is but the one time expensive than that of china 我们的吃钣饭的地方都是外国人开的，里面的东西都是中国货，但比中国贵一倍。
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