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| Rhenium | Rhénium | Renij | Renio | Rhenium | ||||||||||||||||||||
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Re Rhenium |
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- Rhenium was discovered by Walter Noddack, Ida Tacke and Otto Berg (Germany) in 1925. The origin of the name comes from the Latin word Rhenus meaning river Rhine. It is rare and costly, dense, silvery-white metal. Tarnishes in moist air. Resists corrosion and oxidation. Dissolves in nitric and sulfuric acids. Has a very high melting point.
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UEBERGANGSELEMENTE: MANGANGRUPPE | |
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| Relative Atommasse: | 186.207(1) | Elektronenkonfiguration: | [Xe] 4f14 5d5 6s2 |
| Oxidationszustände: | +4 +6 +7 | Elekronegativität: | 1.9 |
| Wärmeleitfähigkeit: | 47.9 W m-1 K-1 | Elektrische Widerstandskraft (20 °C): | 19.3 μΩcm |
| Atomradius: | 137.1 pm | Zustand (20 °C): | fest |
| Dichte (g dm-3): | 21020 (293 K) 18900 (m.p.) |
Atomvolumen (cm3 mol-1): | 8.86 (293 K) 9.85 (m.p.) |
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THERMISCHE EIGENSCHAFTEN | |
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| Schmelzpunkt: | 3186 °C | Bildungsenergie: | 33.1 kJ mol-1 |
| Siedepunkt: | 5596 °C | Verdampfungsenergie: | 704.25 kJ mol-1 |
| Kritische Temperatur: | 20227 °C | Zerstäubungsenergie: | 769 kJ mol-1 |
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IONISIERUNGSENERGIE UND HÄUFIGKEIT | |
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| 1. Ionisierungenergie: | 755.82 kJ mol-1 | Häufigkeit des Elements (Luft): | - ppm |
| 2. Ionisierungenergie: | - kJ mol-1 | Häufigkeit des Elements (Erdkruste): | 0.0005 ppm |
| 3. Ionisierungenergie: | - kJ mol-1 | Häufigkeit des Elements (Ozean): | 1E-10 ppm |
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ISOTOPE | |
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Isotope | Relative Atommasse | Häufigkeit (%) |
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185Re | 184.952956(3) | 37.40(2) |
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187Re | 186.955751(3) | 62.60(2) |
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MINERALIEN UND GEBRAUCH | |
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- Rhenium is found in small amounts in gadolinite and molybdenite. Mixed with tungsten or platinum to make filaments for mass spectrographs. Its main value is as a trace alloying agent for hardening metal components that are subjected to continuous frictional forces. The price of 99.99 % pure rhenium slug is 503.00 € for 50 g.
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REDUKTIONSPOTENTIALE | |
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Balanced half-reaction | Eo / V | Anmerkung |
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Re3+ +3e-  Re(s) |
+0.3 | |
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ReO2(s) + 4H+ + 4e- Re(s) + 2H2O |
+0.26 | |
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ReO4- + 8H+ + 7e- Re(s) + 4H2O |
+0.37 | |
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ReO4- + 4H2O + 7e- Re(s) + 8OH- |
- 0.584 | |
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ReO4- + 4H+ + 3e- ReO2(s) + 2H2O |
+0.51 | |
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ReO4- + 2H2O + 3e- ReO2(s) + 4OH- |
- 0.595 | |
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ReO4- + 2H+ + e- ReO3(s) + 2H2O |
+0.77 | |
