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light element  

Definición

  • Astronomers often refer to hydrogen or helium, including any of their isotopes, as being light elements; all other elements are regarded as being heavy elements. Alternatively, a 'light element' may refer to any chemical element produced during the first few minutes after the Big Bang, including, in addition to hydrogen and helium, lithium, beryllium, and boron. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/L/light_element.html)

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http://data.loterre.fr/ark:/67375/MDL-TR61KTKT-K

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