Fermij
100
Fm
Skupina
n/a
Perioda
7
Blok
f
Protons
Electrons
Neutrons
100
100
157
General Properties
Vrstno število
100
Atomska teža
[257]
Mass Number
257
Kategorija
Aktinoidi
Barva
n/a
Radioactive
Da
Named after Nobel laureate Enrico Fermi, one of the pioneers of nuclear physics
Kristalna struktura
n/a
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.
Electrons per shell
2, 8, 18, 32, 30, 8, 2
Razporeditev elektronov
[Rn] 5f12 7s2
Sixteen isotopes of fermium are known to exist
Physical Properties
Faza snovi
Trdnina
Gostota
-
Tališče
1800,15 K | 1527 °C | 2780,6 °F
Vrelišče
-
Talilna toplota
n/a
Izparilna toplota
n/a
Toplotna kapaciteta
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Zasluge za slike: 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
Atomski polmer
-
Kovalentni polmer
-
Elektronegativnost
1,3 (Paulingova lestvica)
Ionization Potential
6,5 eV
Atomic Volume
29,1 cm3/mol
Toplotna prevodnost
0,1 W/cm·K
Oksidacijska stanja
2, 3
Applications
Fermium is used for scientific research purposes only.
Fermium is harmful due to its radioactivity
Isotopes
Stable Isotopes
-Unstable Isotopes
241Fm, 242Fm, 243Fm, 244Fm, 245Fm, 246Fm, 247Fm, 248Fm, 249Fm, 250Fm, 251Fm, 252Fm, 253Fm, 254Fm, 255Fm, 256Fm, 257Fm, 258Fm, 259Fm, 260Fm