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Thesaurus: atomic number 72
a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
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zirconiumdefinitionchemicallydefinitionelectronsdefinitionelementdefinitionemissiondefinitionfilamentsdefinitionfounddefinitiongreydefinitionmetallicdefinitionmineralsdefinitionreadydefinitionresemblesdefinitiontetravalentdefinitionatomicfamilyatomic bombfamilyatomic clockfamilyatomic cocktailfamilyatomic energyfamilyAtomic Energy Commissionfamilyatomic explosionfamilyatomic massfamilyatomic mass unitfamilyatomic numberfamilyatomic number 1familyatomic number 10familyatomic number 100familyatomic number 101familyatomic number 102family