Fermium

100
Fm
Gruppe
n/a
Periode
7
Blok
f
Protons
Electrons
Neutrons
100
100
157
General Properties
Atomnummer
100
Atommasse
[257]
Mass Number
257
Kategori
Actinider
Farve
n/a
Radioactive
Ja
Named after Nobel laureate Enrico Fermi, one of the pioneers of nuclear physics
Krystalstruktur
n/a
History
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.
Elektroner i hver skal
2, 8, 18, 32, 30, 8, 2
Elektronkonfiguration
[Rn] 5f12 7s2
Fm
Sixteen isotopes of fermium are known to exist
Physical Properties
Tilstandsform
Fast stof
Massefylde
-
Smeltepunkt
1800,15 K | 1527 °C | 2780,6 °F
Kogepunkt
-
Smeltevarme
n/a
Fordampningsvarme
n/a
Varmefylde
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Fermium
Billede akkrediteringer: 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
n/a
Atomic Properties
Atomradius
-
Kovalent radius
-
Elektronegativitet
1,3 (Paulings skala)
Ionization Potential
6,5 eV
Atomic Volume
29,1 cm3/mol
Varmeledningsevne
0,1 W/cm·K
Oxidationstrin
2, 3
Applications
Fermium is used for scientific research purposes only.
Fermium is harmful due to its radioactivity
Isotoper
Stable Isotopes
-
Unstable Isotopes
241Fm, 242Fm, 243Fm, 244Fm, 245Fm, 246Fm, 247Fm, 248Fm, 249Fm, 250Fm, 251Fm, 252Fm, 253Fm, 254Fm, 255Fm, 256Fm, 257Fm, 258Fm, 259Fm, 260Fm