Ordnungszahl: |
100 |
Name: |
Fermium |
Namensursprung: |
Named in honor of the scientist Enrico Fermi. |
Entdeckung: |
1953 by Argonne, Los Alamos, U of Calif in United States |
Beschreibung: |
Synthetic radioactive metal. |
Vorkommen: |
Produced by bombarding lighter transuranium elements with still lighter particles or by neutron capture. |
Verwendung: |
It has no significant commercial applications. |
Gruppe: |
Transition Metal |
Atomgewicht: |
(257.0951) |
Schmelzpunkt: |
-- |
Siedepunkt: |
-- |
Dichte bei 293 K: |
-- |
Aggregatszustand bei Raumtemperatur: |
Not Available |
Schalen: |
2,8,18,32,30,8,2 |
Orbitale: |
[Rn] 5f12 7s2 |
Valenzen: |
-- |
1. Ionisierungs- potential: |
6.50 V |
2. Ionisierungs- potential: |
-- |
3. Ionisierungs- potential: |
-- |
Atomradius: |
-- |
Spezifische Wärme: |
-- |
Verdampfungswärme: |
-- |
Schmelzwärme: |
-- |
Thermischer Ausdehnungskoeffizient: |
-- |
Röntgenemission Energie / Wellenlänge: |
|
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
eV |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
|
Å |
0 |
0 |
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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Å |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Röntgen Fluoreszenz Ausbeute: |
|
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
|
0% |
0% |
0% |
0% |
0% |
0% |
|
|
|
|
Nuklide: |
|
Anteil |
Gewicht |
Spin |
Halbwertszeit |
Zerfallsmodus |
Fm249 |
0% |
249 |
7/2 |
3m |
EC,α |
Fm250 |
0% |
250.08 |
0 |
30m |
α,EC,SF |
Fm251 |
0% |
251 |
9/2 |
5.3h |
EC,α |
Fm252 |
0% |
252.083 |
0 |
1.058d |
α,SF |
Fm253 |
0% |
253.085 |
1/2 |
3d |
EC,α |
Fm254 |
0% |
254.087 |
0 |
3.24h |
α,SF |
Fm255 |
0% |
255.09 |
7/2 |
20.1h |
α,SF |
Fm256 |
0% |
256.092 |
0 |
2.63h |
SF,α |
Fm257 |
0% |
257.095 |
9/2 |
100.5d |
α,SF | |