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Paul Villard
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Paul Villard

French chemist

Learn about this topic in these articles:

study of atomic radiation

  • shell atomic model
    In atom: Discovery of radioactivity

    …was identified by French chemist Paul Villard in 1900. Designated as the gamma ray, it is not deflected by magnets and is much more penetrating than alpha particles. Gamma rays were later shown to be a form of electromagnetic radiation, similar to light or X-rays, but with much shorter wavelengths.…

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