| Ordnungszahl: |
18 |
| Name: |
Argon |
| Namensursprung: |
Greek: argos (inactive). |
| Entdeckung: |
1894 by Sir William Ramsey, Baron Rayleigh in Scotland |
| Beschreibung: |
Colorless, odorless, tasteless noble gas. It is the third most abundant element in the earth's atmosphere and makes up about 1%. |
| Vorkommen: |
Continuously released into the air by decay of radioactive potassium-40. Pure form is obtained from fractional distillation of liquid air. |
| Verwendung: |
Used in lighting products. It is often used in filling incandescent light bulbs. Some is mixed with krypton in fluorescent lamps. Crystals in the semiconductor industry are grown in argon atmospheres. |
| Gruppe: |
Noble Gas |
| Atomgewicht: |
39.948 |
| Schmelzpunkt: |
-189.2°C |
| Siedepunkt: |
-185.7°C |
| Dichte bei 293 K: |
0.0017824 g/cm³ |
| Aggregatszustand bei Raumtemperatur: |
Gas |
| Schalen: |
2,8,8 |
| Orbitale: |
[Ne] 3s2 3p6 |
| Valenzen: |
0 |
| 1. Ionisierungs- potential: |
15.7596 V |
| 2. Ionisierungs- potential: |
27.629 V |
| 3. Ionisierungs- potential: |
40.74 V |
| Atomradius: |
0.88 Å |
| Spezifische Wärme: |
0.520 J/gK |
| Verdampfungswärme: |
6.447 kJ/mol |
| Schmelzwärme: |
1.188 kJ/mol |
| Thermischer Ausdehnungskoeffizient: |
618 10-6 K-1 |
| Röntgenemission Energie / Wellenlänge: |
| |
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
| eV |
2957.12 |
3190.57 |
0 |
0 |
0 |
0 |
|
|
|
| Å |
4.19278 |
3.886 |
0 |
0 |
0 |
0 |
|
|
|
|
| Röntgenabsorption Energie / Wellenlänge: |
| |
K |
L-I |
L-II |
L-III |
M-I |
M-II |
M-III |
M-IV |
M-V |
| eV |
3203 |
0 |
0 |
245 |
0 |
0 |
0 |
0 |
0 |
| Å |
3.87091 |
0 |
0 |
50.6063 |
0 |
0 |
0 |
0 |
0 |
|
| Röntgen Fluoreszenz Ausbeute: |
| |
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
| |
11.5% |
0% |
0% |
0% |
0% |
0% |
|
|
|
|
| Nuklide: |
| |
Anteil |
Gewicht |
Spin |
Halbwertszeit |
Zerfallsmodus |
| Ar36 |
0.337% |
34.9675 |
0 |
|
Stable |
| Ar37 |
0% |
36.9667 |
3/2 |
35.0d |
EC |
| Ar38 |
0.063% |
37.9627 |
0 |
|
Stable |
| Ar39 |
0% |
38.964 |
7/2 |
269y |
β- |
| Ar40 |
99.6% |
39.9624 |
0 |
|
Stable |
| Ar41 |
0% |
41 |
7/2 |
1.82h |
β- |
|
