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- | |