atomic number 90

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Noun1.atomic number 90 - a soft silvery-white tetravalent radioactive metallic elementatomic number 90 - a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
thorium, Th
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
radiothorium, thorium-228 - radioactive isotope of thorium with mass number 228
monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium
thorite - a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite
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del Peloso and Licio da Silva (National Observatory, Rio de Janeiro, Brazil) and their colleagues studied high-quality spectra of about two dozen stars for thorium (atomic number 90) and europium (atomic number 63).
Dating the Milky Way
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