单词 | atomic number 90 |
释义 | atomic number 90 (once / 11819311 pages) n WORD FAMILY atomic number 90 n 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 Syn|Hypo|Hyper Th, thorium radiothorium, thorium-228 radioactive isotope of thorium with mass number 228 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. |
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