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Thesaurus: atomic number 63
a bivalent and trivalent metallic element of the rare earth group
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bivalentdefinitionearthdefinitionelementdefinitiongroupdefinitionmetallicdefinitionraredefinitiontrivalentdefinitionatomicfamilyatomic bombfamilyatomic clockfamilyatomic cocktailfamilyatomic energyfamilyAtomic Energy Commissionfamilyatomic explosionfamilyatomic massfamilyatomic mass unitfamilyatomic numberfamilyatomic number 1familyatomic number 10familyatomic number 100familyatomic number 101familyatomic number 102familyatomic number 103familyatomic number 104familyatomic number 105familyatomic number 106familyatomic number 107familyatomic number 108family