Ordnungszahl: |
45 |
Name: |
Rhodium |
Namensursprung: |
Greek: rhodon (rose). Its salts give a rosy solution. |
Entdeckung: |
1803 by William Wollaston in England |
Beschreibung: |
Hard, silvery-white metal |
Vorkommen: |
Obtained as a by-product of nickel production. |
Verwendung: |
Used as a coating to prevent wear on high quality science equipment and with platinum to make thermocouples. |
Gruppe: |
Transition Metal |
Atomgewicht: |
102.90550 |
Schmelzpunkt: |
1966°C +/-3°C |
Siedepunkt: |
3695°C |
Dichte bei 293 K: |
12.4 g/cm³ |
Aggregatszustand bei Raumtemperatur: |
Solid |
Schalen: |
2,8,18,16,1 |
Orbitale: |
[Kr] 4d8 5s1 |
Valenzen: |
2,3,4,5,6 |
1. Ionisierungs- potential: |
7.4589 V |
2. Ionisierungs- potential: |
18.08 V |
3. Ionisierungs- potential: |
31.06 V |
Atomradius: |
1.83 Å |
Spezifische Wärme: |
0.242 J/gK |
Verdampfungswärme: |
493.0 kJ/mol |
Schmelzwärme: |
21.50 kJ/mol |
Thermischer Ausdehnungskoeffizient: |
8.2 10-6 K-1 |
Röntgenemission Energie / Wellenlänge: |
|
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
eV |
20169.1 |
22724.6 |
2696.84 |
2834.51 |
0 |
0 |
|
|
|
Å |
0.61472 |
0.5456 |
4.59743 |
4.37414 |
0 |
0 |
|
|
|
|
Röntgenabsorption Energie / Wellenlänge: |
|
K |
L-I |
L-II |
L-III |
M-I |
M-II |
M-III |
M-IV |
M-V |
eV |
23220 |
3412 |
3147 |
3004 |
0 |
0 |
0 |
0 |
307 |
Å |
0.53396 |
3.6338 |
3.9398 |
4.12734 |
0 |
0 |
0 |
0 |
40.3861 |
|
Röntgen Fluoreszenz Ausbeute: |
|
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
|
80.6% |
0% |
5.2% |
0% |
0% |
0% |
|
|
|
|
Nuklide: |
|
Anteil |
Gewicht |
Spin |
Halbwertszeit |
Zerfallsmodus |
Rh101 |
0% |
101 |
1/2 |
3.3y |
EC |
Rh101m |
0% |
101 |
9/2 |
4.35d |
EC,IT |
Rh102 |
0% |
102 |
6 |
~2.9y |
EC |
Rh102m |
0% |
102 |
2 |
207d |
EC,β-,β+ |
Rh103 |
100% |
102.906 |
1/2 |
|
Stable |
Rh103m |
0% |
103 |
7/2 |
56.12m |
IT |
Rh105 |
0% |
105 |
7/2 |
35.36h |
β- |
Rh105m |
0% |
105 |
1/2 |
40s |
IT |
Rh106 |
0% |
106 |
1 |
29.9s |
β- | |