1 Results for atomic number 69
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หรือค้นหา: -atomic number 69-, *atomic number 69*
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WordNet (3.0)
| thulium | (n) 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, Syn. atomic number 69, Tm |
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