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EnglishTHE SCHOLAR'S LEXICON

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. 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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