- 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
Hypernym for "atomic number 69"
- metallic element
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