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Meaning of ATOMIC NUMBER 72

 
WordNet Dictionary
 
 Definition: 
[n]  a gray tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
 
 Synonyms: hafnium, Hf
 
 See Also: metal, metallic element

 

 

 

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