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hafnium
[ haf-nee-uhm, hahf- ]
noun
, Chemistry.
- a gray, toxic metallic element with a high melting point (over 2000°C), found in most zirconium minerals. : Hf; : 178.49; : 72; : 12.1.
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
hafnium
/ hăf′nē-əm /
- A bright, silvery metallic element that occurs in zirconium ores. Because hafnium absorbs neutrons better than any other metal and is resistant to corrosion, it is used to control nuclear reactions. Atomic number 72; atomic weight 178.49; melting point 2,220°C; boiling point 5,400°C; specific gravity 13.3; valence 4.
- See Periodic Table
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Word History and Origins
Discover More
Word History and Origins
Origin of hafnium1
C20: New Latin, named after Hafnia, Latin name of Copenhagen + -ium
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