| 单词 | hafnium |
| 释义 | Word Frequency hafnium(ˈhæfnɪəm) noun 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 Word origin C20: New Latin, named after Hafnia, Latin name of Copenhagen + -ium |
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