actinium 的定义
Chemistry.
- a radioactive silver-white metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence. Symbol: Ac; atomic number: 89; atomic weight: 227.
更多actinium例句
- On Rutherford's theory then, actinium should always accompany uranium and radium, but in very subordinate amount.
- For if actinium was an independent element we would be sure to find actinium haloes.
- The element has since been found in nature as a small constituent of the natural decay of actinium.
- The emanation deposits two successive disintegration products actinium-A and actinium-B.
- What is the final non-active product of the series of changes we have traced from uranium through actinium and radium?