atomic number 69 definition

  • noun:
    • a soft silvery metallic element of the rare-earth group; isotope 170 produces X-rays and is utilized in small lightweight X-ray devices; it takes place in monazite and apatite and xenotime
    • a soft silvery metallic component of the rare-earth team; isotope 170 produces X-rays and it is utilized in little transportable X-ray devices; it happens in monazite and apatite and xenotime

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  • Hypernym for "atomic number 69"
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