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atomic number 69 (0 synonym found)
Definition of atomic number 69:
(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
Definition of atomic number 69:
(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
A make the world a better place giveback project.
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