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Thesaurus: atomic number 57
a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
Related headwords
earthdefinitionraredefinitionclassifieddefinitionelementdefinitionmetallicdefinitionmineralsdefinitionoccursdefinitionreadilydefinitionsoftdefinitiontarnishesdefinitionwhitedefinitionatomicfamilyatomic bombfamilyatomic clockfamilyatomic cocktailfamilyatomic energyfamilyAtomic Energy Commissionfamilyatomic explosionfamilyatomic massfamilyatomic mass unitfamilyatomic numberfamilyatomic number 1familyatomic number 10familyatomic number 100familyatomic number 101familyatomic number 102familyatomic number 103familyatomic number 104family