Fermij
100
Fm
Skupina
n/p
Perioda
7
Blok
f
Protoni
Elektroni
Nevtroni
100
100
157
Splošne lastnosti
Vrstno število
100
Atomska teža
[257]
Masno število
257
Kategorija
Aktinoidi
Barva
n/p
Radioaktivno
Da
Named after Nobel laureate Enrico Fermi, one of the pioneers of nuclear physics
Kristalna struktura
n/p
Zgodovina
Fermium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952.
It was identified by Albert Ghiorso and co-workers at the University of California, Berkeley in collaboration with the Argonne and Los Alamos National Laboratories, in the fallout from the Ivy Mike nuclear test.
The new element was produced by the nuclear fission of 17 neutrons with uranium-238.
It was identified by Albert Ghiorso and co-workers at the University of California, Berkeley in collaboration with the Argonne and Los Alamos National Laboratories, in the fallout from the Ivy Mike nuclear test.
The new element was produced by the nuclear fission of 17 neutrons with uranium-238.
Elektroni po lupinah
2, 8, 18, 32, 30, 8, 2
Razporeditev elektronov
[Rn] 5f12 7s2
Sixteen isotopes of fermium are known to exist
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
- g/cm3
Tališče
1800,15 K | 1527 °C | 2780,6 °F
Vrelišče
-
Talilna toplota
n/p kJ/mol
Izparilna toplota
n/p kJ/mol
Toplotna kapaciteta
- J/g·K
Zastopanost v Zemljini skorji
n/p
Zastopanost v vesolju
n/p
Zasluge za slike: Wikimedia Commons (National Nuclear Security Administration)
Fermium was first observed in the fallout from the Ivy Mike nuclear test
CAS številka
7440-72-4
PubChem CID številka
n/p
Atomske lastnosti
Atomski polmer
-
Kovalentni polmer
-
Elektronegativnost
1,3 (Paulingova lestvica)
Ionizacijski potencial
6,5 eV
Atomski volumen
29,1 cm3/mol
Toplotna prevodnost
0,1 W/cm·K
Oksidacijska stanja
2, 3
Uporabe
Fermium is used for scientific research purposes only.
Fermium is harmful due to its radioactivity
Izotopi
Stabilni izotopi
-Nestabilni izotopi
241Fm, 242Fm, 243Fm, 244Fm, 245Fm, 246Fm, 247Fm, 248Fm, 249Fm, 250Fm, 251Fm, 252Fm, 253Fm, 254Fm, 255Fm, 256Fm, 257Fm, 258Fm, 259Fm, 260Fm