- a bright metallic element found in zirconium ores: used in tungsten filaments and as a neutron absorber in nuclear reactors. Symbol: Hf; atomic no: 72; atomic wt: 178.49; valency: 4; relative density: 13.31; melting pt: 2231±20°C; boiling pt: 4603°C
| 单词 | hafnium |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 haf•ni•um (haf′nē əm, häf′-),USA pronunciation n. [Chem.]
Collins Concise English Dictionary © HarperCollins Publishers:: hafnium /ˈhæfnɪəm/ n
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