- atomic number 69 als zelfstandig naamwoord:
- 1
atomic number 69
zelfstandig naamwoord
1 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.
Nederlands: thulium
Pools: tul, Tm
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