|
|
Rhenium (Re)
| Ordnungszahl: |
75 |
| Name: |
Rhenium |
| Namensursprung: |
Latin: Rhenus, the Rhine River. |
| Entdeckung: |
1925 by Walter Noddack, Ida Tacke, Otto Berg in Germany |
| Beschreibung: |
Rare and costly, dense, silvery-white metal. |
| Vorkommen: |
Found in small amounts in gadolinite and molybdenite. Has a very high melting point. |
| Verwendung: |
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. |
| Gruppe: |
Transition Metal |
| Atomgewicht: |
186.207 |
| Schmelzpunkt: |
3180°C |
| Siedepunkt: |
5627°C (estimated) |
| Dichte bei 293 K: |
21.0 g/cm³ |
| Aggregatszustand bei Raumtemperatur: |
Solid |
| Schalen: |
2,8,18,32,13,2 |
| Orbitale: |
[Xe] 4f14 5d5 6s2 |
| Valenzen: |
-1,1,2,3,4,5,6,7 |
| 1. Ionisierungs- potential: |
7.88 V |
| 2. Ionisierungs- potential: |
-- |
| 3. Ionisierungs- potential: |
-- |
| Atomradius: |
1.97 Å |
| Spezifische Wärme: |
0.13 J/gK |
| Verdampfungswärme: |
715.0 kJ/mol |
| Schmelzwärme: |
33.20 kJ/mol |
| Thermischer Ausdehnungskoeffizient: |
6.2 10-6 K-1 |
| Röntgenemission Energie / Wellenlänge: |
| |
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
| eV |
0 |
0 |
8652.76 |
10010.3 |
1842.55 |
1906.3 |
|
|
|
| Å |
0 |
0 |
1.4329 |
1.23858 |
6.72901 |
6.50398 |
|
|
|
|
| Röntgenabsorption Energie / Wellenlänge: |
| |
K |
L-I |
L-II |
L-III |
M-I |
M-II |
M-III |
M-IV |
M-V |
| eV |
71672 |
12526 |
11958 |
10535 |
2932 |
2682 |
2368 |
1949 |
1883 |
| Å |
0.17299 |
0.98982 |
|
1.03684 |
1.17689 |
4.2287 |
4.62287 |
5.23587 |
6.36149 |
|
| Röntgen Fluoreszenz Ausbeute: |
| |
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
| |
95.9% |
0% |
31.5% |
0% |
0% |
0% |
|
|
|
|
| Nuklide: |
| |
Anteil |
Gewicht |
Spin |
Halbwertszeit |
Zerfallsmodus |
| Re182 |
0% |
182 |
7 |
2.67d |
EC |
| Re182m |
0% |
182 |
2 |
12.7h |
EC,β+ |
| Re183 |
0% |
183 |
5/2 |
70d |
EC |
| Re184 |
0% |
184 |
3 |
38d |
EC |
| Re184m |
0% |
184 |
8 |
165d |
IT,EC |
| Re185 |
37.07% |
184.953 |
5/2 |
|
Stable |
| Re186 |
0% |
186 |
1 |
3.777d |
β-,EC |
| Re187 |
62.93% |
186.956 |
5/2 |
4.1E10y |
β- |
| Re188 |
0% |
188 |
1 |
16.94h |
β- |
|
|
|
