Ordnungszahl: |
71 |
Name: |
Lutetium |
Namensursprung: |
Named for the ancient name of Paris, Lutecia. |
Entdeckung: |
1907 by Georges Urbain in France |
Beschreibung: |
Silvery-white, hard, dense, rare earth metal. |
Vorkommen: |
Found with ytterbium in gadolinite and xenotime.
Usually obtained from monazite sand which is ofter 50% rare earth by
weight and 0.003% lutetium. |
Verwendung: |
It has no practical applications. |
Gruppe: |
Actinide Metal |
Atomgewicht: |
174.967 |
Schmelzpunkt: |
1663°C |
Siedepunkt: |
3402°C |
Dichte bei 293 K: |
9.85 g/cm³ |
Aggregatszustand bei Raumtemperatur: |
Solid |
Schalen: |
2,8,18,32,9,2 |
Orbitale: |
[Xe] 4f14 5d1 6s2 |
Valenzen: |
3 |
1. Ionisierungs- potential: |
5.4259 V |
2. Ionisierungs- potential: |
13.888 V |
3. Ionisierungs- potential: |
20.957 V |
Atomradius: |
2.25 Å |
Spezifische Wärme: |
0.15 J/gK |
Verdampfungswärme: |
355.90 kJ/mol |
Schmelzwärme: |
18.60 kJ/mol |
Thermischer Ausdehnungskoeffizient: |
8.2 10-6 K-1 |
Röntgenemission Energie / Wellenlänge: |
|
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
eV |
0 |
0 |
7655.73 |
8709.35 |
1581.45 |
1631.17 |
|
|
|
Å |
0 |
0 |
1.61951 |
1.42359 |
7.83998 |
7.60101 |
|
|
|
|
Röntgenabsorption Energie / Wellenlänge: |
|
K |
L-I |
L-II |
L-III |
M-I |
M-II |
M-III |
M-IV |
M-V |
eV |
63310 |
10870 |
10348 |
9244 |
2492 |
2264 |
2024 |
1640 |
1589 |
Å |
0.19583 |
1.14062 |
1.19816 |
1.34125 |
4.97534 |
5.47639 |
6.12576 |
7.56009 |
7.80273 |
|
Röntgen Fluoreszenz Ausbeute: |
|
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
|
95.2% |
0% |
27.2% |
0% |
0% |
0% |
|
|
|
|
Nuklide: |
|
Anteil |
Gewicht |
Spin |
Halbwertszeit |
Zerfallsmodus |
Lu173 |
0% |
173 |
7/2 |
1.37y |
EC |
Lu174 |
0% |
174 |
1 |
3.3y |
EC,β+ |
Lu174m |
0% |
174 |
6 |
142d |
IT,EC |
Lu175 |
97.41% |
174.941 |
7/2 |
|
Stable |
Lu176 |
2.59% |
175.943 |
7 |
3.6E10y |
β- |
Lu177 |
0% |
177 |
7/2 |
6.68d |
β- |
Lu177m |
0% |
177 |
23/2 |
160.7d |
β-,IT | |