| Ordnungszahl: |
38 |
| Name: |
Strontium |
| Namensursprung: |
From the Scottish town, Strontian. |
| Entdeckung: |
1790 by A. Crawford in Scotland |
| Beschreibung: |
Soft, malleable, silvery-yellow metal. |
| Vorkommen: |
Found in minerals celestite and strontianite. |
| Verwendung: |
Used in flares and fireworks for crimson color. Strontium-90 is a long lived highly radioactive fallout product of atomic-bomb explosions. |
| Gruppe: |
Alkali Earth Metal |
| Atomgewicht: |
87.62 |
| Schmelzpunkt: |
769°C |
| Siedepunkt: |
1384°C |
| Dichte bei 293 K: |
2.6 g/cm³ |
| Aggregatszustand bei Raumtemperatur: |
Solid |
| Schalen: |
2,8,18,8,2 |
| Orbitale: |
[Kr] 5s2 |
| Valenzen: |
2 |
| 1. Ionisierungs- potential: |
5.6948 V |
| 2. Ionisierungs- potential: |
11.03 V |
| 3. Ionisierungs- potential: |
43.60 V |
| Atomradius: |
2.45 Å |
| Spezifische Wärme: |
0.30 J/gK |
| Verdampfungswärme: |
144.0 kJ/mol |
| Schmelzwärme: |
8.30 kJ/mol |
| Thermischer Ausdehnungskoeffizient: |
22.5 10-6 K-1 |
| Röntgenemission Energie / Wellenlänge: |
| |
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
| eV |
14143.1 |
15836.3 |
1806.63 |
1871.79 |
0 |
0 |
|
|
|
| Å |
0.87664 |
0.78291 |
6.8628 |
6.62389 |
0 |
0 |
|
|
|
|
| Röntgenabsorption Energie / Wellenlänge: |
| |
K |
L-I |
L-II |
L-III |
M-I |
M-II |
M-III |
M-IV |
M-V |
| eV |
16105 |
2217 |
2007 |
1940 |
0 |
0 |
0 |
0 |
133 |
| Å |
0.76985 |
5.59249 |
6.17765 |
6.391 |
0 |
0 |
0 |
0 |
93.2221 |
|
| Röntgen Fluoreszenz Ausbeute: |
| |
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
| |
69.1% |
0% |
2.4% |
0% |
0% |
0% |
|
|
|
|
| Nuklide: |
| |
Anteil |
Gewicht |
Spin |
Halbwertszeit |
Zerfallsmodus |
| Sr82 |
0% |
82 |
0 |
25.36d |
EC |
| Sr83 |
0% |
83 |
7/2 |
1.350d |
EC,β+ |
| Sr84 |
0.56% |
83.9134 |
0 |
|
Stable |
| Sr85 |
0% |
84.913 |
9/2 |
64.84d |
EC |
| Sr85m |
0% |
85 |
1/2 |
1.27h |
IT,EC |
| Sr86 |
9.86% |
85.9093 |
0 |
|
Stable |
| Sr87 |
7.02% |
86.9089 |
9/2 |
|
Stable |
| Sr87m |
0% |
87 |
1/2 |
2.80h |
IT,EC |
| Sr88 |
82.56% |
87.9056 |
0 |
|
Stable |
| Sr89 |
0% |
88.907 |
5/2 |
50.52d |
β- |
| Sr90 |
0% |
89.907 |
0 |
29.1y |
β- |
| Sr91 |
0% |
91 |
5/2 |
9.50h |
β-,β- |
| Sr92 |
0% |
92 |
0 |
2.71h |
β- |
| Sr93 |
0% |
93 |
5/2 |
7.4m |
β- |
|
