Fermium
100
Fm
Gruppe
n/a
Periode
7
Blok
f
Protoner
Elektroner
Neutroner
100
100
157
Generelle Egenskaber
Atomnummer
100
Atommasse
[257]
Masseantal
257
Kategori
Actinider
Farve
n/a
Radioaktiv
Ja
Named after Nobel laureate Enrico Fermi, one of the pioneers of nuclear physics
Krystalstruktur
n/a
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 i hver skal
2, 8, 18, 32, 30, 8, 2
Elektronkonfiguration
[Rn] 5f12 7s2
Sixteen isotopes of fermium are known to exist
Fysiske Egenskaber
Tilstandsform
Fast stof
Massefylde
-
Smeltepunkt
1800,15 K | 1527 °C | 2780,6 °F
Kogepunkt
-
Smeltevarme
n/a
Fordampningsvarme
n/a
Varmefylde
-
Forekomst i jordskorpen
n/a
Forekomst i universet
n/a
Billede akkrediteringer: Wikimedia Commons (National Nuclear Security Administration)
Fermium was first observed in the fallout from the Ivy Mike nuclear test
CAS-nummer
7440-72-4
PubChem CID-nummer
n/a
Atomare egenskaber
Atomradius
-
Kovalent radius
-
Elektronegativitet
1,3 (Paulings skala)
Ioniseringspotentiale
6,5 eV
Atomvolumen
29,1 cm3/mol
Varmeledningsevne
0,1 W/cm·K
Oxidationstrin
2, 3
Anvendelser
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