Fermium
100
Fm
Gruppe
I/T
Periode
7
Blokk
f
Protoner
Elektroner
Nøytroner
100
100
157
Generelle egenskaper
Atomnummer
100
Atomvekt
[257]
Massetall
257
Kategori
Aktinoider
Farge
I/T
Radioaktiv
Ja
Named after Nobel laureate Enrico Fermi, one of the pioneers of nuclear physics
Krystallstruktur
I/T
Historie
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.
Elektroner per energinivå
2, 8, 18, 32, 30, 8, 2
Elektronkonfigurasjon
[Rn] 5f12 7s2
Sixteen isotopes of fermium are known to exist
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
-
Smeltepunkt
1800,15 K | 1527 °C | 2780,6 °F
Kokepunkt
-
Smeltevarme
I/T
Fordampningsvarme
I/T
Spesifikk varmekapasitet
-
Forekomst i jordskorpa
I/T
Forekomst i universet
I/T
Bildekreditter: Wikimedia Commons (National Nuclear Security Administration)
Fermium was first observed in the fallout from the Ivy Mike nuclear test
CAS Number
7440-72-4
PubChem CID Number
I/T
Atomegenskaper
Atomradius
-
Kovalent radius
-
Elektronegativitet
1,3 (Pauling-skalaen)
Ioniseringsenergi
6,5 eV
Molart volum
29,1 cm3/mol
Termisk ledningsevne
0,1 W/cm·K
Oksidasjonstilstander
2, 3
Bruksområder
Fermium is used for scientific research purposes only.
Fermium is harmful due to its radioactivity
Isotoper
Stabile isotoper
-Ustabile isotoper
241Fm, 242Fm, 243Fm, 244Fm, 245Fm, 246Fm, 247Fm, 248Fm, 249Fm, 250Fm, 251Fm, 252Fm, 253Fm, 254Fm, 255Fm, 256Fm, 257Fm, 258Fm, 259Fm, 260Fm