actinium
/ak-tin-ee-uhm/US // ækˈtɪn i əm //UK // (ækˈtɪnɪəm) //
阴阳师,阴阳眼,阴阳人,阴阳鱼
Definitions
n.名词 noun
- 1
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.
Examples
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?
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