1 Jan 1905 Jahr - 1905 - Discovery of "radiothorium" Hahn discovers "radiothorium", which is now known as thorium-x, an isotope of thorium. An isotope is a variant of an element with a different number of neutrons, but the same number of protons and electrons as that element. This discovery was made while working alongside Sir William Ramsay at University College in London.
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1 Jan 1905 Jahr
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~ 120 years ago