Definition of Atomic number 69
1. Noun. 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.
Generic synonyms: Metal, Metallic Element
Substance meronyms: Apatite, Monazite, Xenotime
Atomic Number 69 Pictures
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