n.[化]钫

The half-life of francium is 22 minutes. 钫的半衰期是22分钟。

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。

So little is known about it, because there is only about 1 ATOM OF FRANCIUM IN A CUBIC FOOT OF URANIUM ORE! 对它所知甚少,因为在1立方英尺的铀矿石中,仅有1个钫原子!

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。

The half-life of francium is 22 minutes 钫的半衰期是22分钟。