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Hf
in WebElements
in X-Ray info
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Hf, 72
hafnium (English)
hafnium, m. (French)
Hafnium, n. (German)
gafnij (Russian)
hafnio??? (Spanish)
hafnium (Swedish)
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| Symbol, number | Hf, 72 (metal), Group: 4; 4B |
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| Weight | 178.49 |
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| In Nature | |
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| Discovered | 1923, by George de Hevesy and Dirk Coster (Denmark) |
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| Density [kg/m3] | 13310 [293 K] (solid) 12000 [2503 K] (liquid) |
| Molar volume | 13.41 cm3 |
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| Melting Temperature | 2503 K (2230 °C) Enthalpy: 661.1 kJ/mol |
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| Boiling Temperature | 5470 K (5197 °C) Enthalpy: 25.5 kJ/mol |
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| Electrical resistance | 35.1E-8 [293 K] Wm |
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| Thermal | Conductivity: 23.0 [300 K] W/Km Expansion: 5.9E-6 /K |
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| Ionisation [kJ/mol] |
| M--> |
M+--> |
M2+--> |
M3+--> |
M4+--> |
M5+--> |
M6+--> |
M7+--> |
M8+--> |
M9+-->M10+ |
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| Thermodynamics |
| State |
DfH° |
DfG° |
S° |
CpH |
H°298.15-H°0 |
| [kJ/mol] |
[J/Kmol] |
[kJ/mol] |
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| Isotopes |
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Mass |
In nature |
Half-life |
Spin |
m/mN |
NMM |
Decay |
| Hf |
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