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单词 atomic number 90
释义
atomic number 90
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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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