n.[化]鈁

The half-life of francium is 22 minutes. 鈁的半衰期是22分鐘。

Francium is the densest of the Alkali Metals and also radioactive. 鈁是堿金屬中密度最大的,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! 對它所知甚少,因為在1立方英尺的鈾礦石中,僅有1個鈁原子!

Because Francium is mainly only found synthetically in laboratory research, it has no known use outside of the laboratory. 由于鈁主要僅在實驗室研究中產(chǎn)生,它在實驗室外沒有已知的用途。

The half-life of francium is 22 minutes 鈁的半衰期是22分鐘。