| 释义 |
francium
英音 [ ˈfrænsiəm ]
美音 [ ˈfrænsiəm ]
释义
n. 元素钫
例句
1·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。
2·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。
3·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。
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