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英英字典: atomic_number_69

atomic number 69   (TTS Sound)



Overview of noun atomic_number_69

The noun atomic number 69 has 1 sense


  • thulium, Tm, atomic number 69 -- (a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime)

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