Actinide series

the series of radioactive elements that starts with actinium and ends with lawrencium.
a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium


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  • Actiniform

    having a radiate form. Historical Examples The animals are actiniform, furnished with numerous cleft tentacula, in the centre of which is the polygonal mouth. The Ocean World: Louis Figuier adjective another word for actinoid

  • Actinin

    a contractile protein of muscle.

  • Actinism

    the property of radiation by which chemical effects are produced. Historical Examples In summer, when the maturing process advances, light and heat increase, and actinism relatively declines. The Reason Why Anonymous In the autumn, when the ripening period arrives, light and actinism give way to a greater ratio of heat. The Reason Why Anonymous The […]

  • Actinium

    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. Historical Examples Other radio-active substances have each several derivatives: actinium has nine, uranium has four. Inventors at Work George Iles actinium, an element or elementary substance obtained […]

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