| Ordnungszahl: |
43 |
| Name: |
Technetium |
| Namensursprung: |
Greek: technêtos (artificial). |
| Entdeckung: |
1937 by Carlo Perrier, Émillo Segrè in Italy |
| Beschreibung: |
Silvery-gray metal. First synthetically produced element. |
| Vorkommen: |
Made first by bombarding molybdenum with deuterons (heavy hydrogen) in a cyclotron. |
| Verwendung: |
Added to iron in quantities as low as 55 part-per-million transforms the iron into a corrosion-resistant alloy. |
| Gruppe: |
Transition Metal |
| Atomgewicht: |
(97.9072) |
| Schmelzpunkt: |
2172°C |
| Siedepunkt: |
4877°C |
| Dichte bei 293 K: |
11.5 g/cm³ |
| Aggregatszustand bei Raumtemperatur: |
Solid |
| Schalen: |
2,8,18,13,2 |
| Orbitale: |
[Kr] 4d5 5s2 |
| Valenzen: |
0,2,4,5,6,7 |
| 1. Ionisierungs- potential: |
7.28 V |
| 2. Ionisierungs- potential: |
15.26 V |
| 3. Ionisierungs- potential: |
29.54 V |
| Atomradius: |
1.95 Å |
| Spezifische Wärme: |
0.21 J/gK |
| Verdampfungswärme: |
660.0 kJ/mol |
| Schmelzwärme: |
24.0 kJ/mol |
| Thermischer Ausdehnungskoeffizient: |
8 10-6 K-1 |
| Röntgenemission Energie / Wellenlänge: |
| |
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
| eV |
18328.8 |
20619.6 |
2424.05 |
2536.89 |
0 |
0 |
|
|
|
| Å |
0.67645 |
0.60129 |
5.1148 |
4.8873 |
0 |
0 |
|
|
|
|
| Röntgenabsorption Energie / Wellenlänge: |
| |
K |
L-I |
L-II |
L-III |
M-I |
M-II |
M-III |
M-IV |
M-V |
| eV |
21044 |
3043 |
2794 |
2677 |
0 |
0 |
0 |
0 |
253 |
| Å |
0.58917 |
4.07445 |
4.43756 |
4.63151 |
0 |
0 |
0 |
0 |
49.0061 |
|
| Röntgen Fluoreszenz Ausbeute: |
| |
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
| |
77.9% |
0% |
4.3% |
0% |
0% |
0% |
|
|
|
|
| Nuklide: |
| |
Anteil |
Gewicht |
Spin |
Halbwertszeit |
Zerfallsmodus |
| Tc95 |
0% |
95 |
9/2 |
20.0h |
EC |
| Tc95m |
0% |
95 |
1/2 |
61.0d |
EC,IT |
| Tc96 |
0% |
96 |
7 |
4.28d |
EC |
| Tc96m |
0% |
96 |
4 |
51.5m |
IT,EC,β+ |
| Tc97 |
0% |
97 |
9/2 |
2.6E06y |
EC |
| Tc97m |
0% |
97 |
1/2 |
90.0d |
IT |
| Tc98 |
0% |
97.9072 |
6 |
4.2E06y |
β- |
| Tc99 |
0% |
98.908 |
9/2 |
2.13E05y |
β- |
| Tc99m |
0% |
97 |
1/2 |
6.01h |
IT,β- |
| Tc101 |
0% |
101 |
9 |
14.2m |
β- |
|
