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单词 atomic number 90
释义
Atomic Number 90
nnoun.substancea 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
Synset:Th thorium
Derivationally Related Form:thoriate
Substance Holonyms:monazite thorite
Hypernyms:metal metallic element
Inherited Hypernyms:thoriummetallic elementchemical elementsubstancematterphysical entityentity
Inherited Hypernyms:thoriummetallic elementchemical elementsubstancepartrelationabstractionentity
Direct Hyponyms:radiothoriumthorium-228
Full Hyponyms:
thorium-228
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