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英英字典: atomic_number_90

atomic number 90   (TTS Sound)



Overview of noun atomic_number_90

The noun atomic number 90 has 1 sense


  • thorium, Th, atomic 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)

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