(Elements & Compounds) 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 is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. en.wikipedia.org en.wikipedia.org 铪: ...
Hafnium is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869. Hafnium was the penultimate stable isotope...
Hafnium is a chemical element; it has symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869, though it was not identified until...
Element Data Atomic Symbol: Hf Atomic Number: 72 Atomic Weight: 178.49 g/mol Isotopes and Abundances: 174 Hf 0.16% , 176 Hf 5.26% , 177 Hf 18.60% , 178 Hf 27.28% , 179 Hf 13.62% , 180 Hf 35.08% 1 Atm Melting Point: 2233 掳C 1 Atm Boiling Point: 4603 掳C Common Valences: 4...
a gray metallic element that is useful because of its ready absorption of neutrons see element hafnium医学词典英英释义 hafniumnoun a metallic element that resembles zirconium chemically, occurs in zirconium minerals, and readily absorbs neutrons—symbol Hf see Chemical Elements Table ...
Hafnium (pronounced as HAF-nee-uhm) belongs to the family of transition metals, denoted by the chemical symbol Hf. It has thirty-two isotopes with known half-lives, of which only six exist naturally [1, 2]. Hafnium Symbol Where is the Element Found It is extracted from zircon ores whose...
(symbolHf) aradioactivechemical element.Hafniumis a hard silver-grey metal. Word Origin Join us Join our community to access the latest language learning and assessment tips from Oxford University Press! Seehafniumin the Oxford Advanced American Dictionary ...
Element Name: Hafnium Element Symbol: Hf Atomic Number: 72 Appearance: Steel gray metal Group: Group 4 (Transition Metal) Period: Period 6 Discovery: Dirk Coster and George de Hevesy (1922) Sources Hevesy, G. “The Discovery and Properties of Hafnium.” Chemical Reviews, vol. 2, no. 1,...
"harbor," the usual pre-1400 name of Copenhagen, Denmark, where the element was… See origin and meaning of hafnium.