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Thesaurus: 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
Related headwords
apatitedefinitionearthdefinitionelementdefinitionemitsdefinitiongroupdefinitionisotopedefinitionmachinesdefinitionmetallicdefinitionmonazitedefinitionoccursdefinitionportabledefinitionraredefinitionsilverydefinitionsmalldefinitionsoftdefinitionX-raydefinitionx-raysdefinitionxenotimedefinitionatomicfamilyatomic bombfamilyatomic clockfamilyatomic cocktailfamilyatomic energyfamilyAtomic Energy Commissionfamilyatomic explosionfamilyatomic massfamilyatomic mass unitfamilyatomic numberfamily