francium

基本解釋

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!
Even Francium's most stable isotope, Francium-223 only has a half-life of 22 minutes.
鈁的最穩(wěn)定的同位素,鈁-223也只有22分鐘的半衰期。
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。