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Thesaurus: atomic number 61
a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
Related headwords
discovereddefinitionearthdefinitionelementdefinitionfissiondefinitionformdefinitiongroupdefinitionisotopedefinitionmetallicdefinitionproductdefinitionradioactivedefinitionraredefinitionsilverydefinitionsoftdefinitionstabledefinitionuraniumdefinitionatomicfamilyatomic bombfamilyatomic clockfamilyatomic cocktailfamilyatomic energyfamilyAtomic Energy Commissionfamilyatomic explosionfamilyatomic massfamilyatomic mass unitfamilyatomic numberfamilyatomic number 1familyatomic number 10familyatomic number 100family