francium

francium

1. any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

周期表中I族的任何单价金属（锂、钠、钾、铷、铯和钫）

2. any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium).

周期表中I族的任何单价金属（锂、钠、钾、铷、铯和钫）。

3. 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!

4. francium oxide

氧化钫

5. 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。

6. "Alkali metal:Any of the six chemical elements in the leftmost group of the periodic table (lithium, sodium, potassium, rubidium, cesium, and francium)."

碱金属: 碱金属是元素周期表中的Ia族元素,按原子序数增加的顺序排列为︰锂、钠、钾、铷、铯和。

7. francium [Fm]

钫

8. francium compound

钫化合物

9. 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。

10. The half-life of francium is 22 minutes

钫的半衰期是22分钟。

11. 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。