Meaning of ATOMIC NUMBER 72
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 WordNet Dictionary |
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| | 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 |
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| | Synonyms: | | hafnium, Hf |
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| | See Also: | | metal, metallic element | |
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