francium例句
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.
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.