Fermiu
100
Fm
Grupă
n/a
Perioadă
7
Bloc
f
Protoni
Electroni
Neutroni
100
100
157
Proprietăți Generale
Număr atomic
100
Masă atomică
[257]
Numar de masa
257
Categorie
Actinide
Culoare
n/a
Radioactive
Da
Numit după laureatul Nobel Enrico Fermi, unul dintre pionerii fizicii nucleare
Structură cristalină
n/a
Istoric
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.
Electroni pe nivelul de energie
2, 8, 18, 32, 30, 8, 2
Configurație electronică
[Rn] 5f12 7s2
Sixteen isotopes of fermium are known to exist
Proprietăți Fizice
Fază
Solid
Densitate
-
Punct de topire
1800,15 K | 1527 °C | 2780,6 °F
Punct de fierbere
-
Energie de fuziune
n/a
Energie de evaporare
n/a
Căldură specifică
-
Abundența în scoarța Pământului
n/a
Abundența în Univers
n/a
Credite imagine: Wikimedia Commons (National Nuclear Security Administration)
Fermium was first observed in the fallout from the Ivy Mike nuclear test
Numarul CAS
7440-72-4
Număr CID PubChem
n/a
Proprietăți Atomice
Rază atomică
-
Rază de covalență
-
Electronegativitate
1,3 (Scara lui Pauling)
Potențial de ionizare
6,5 eV
Volum molar
29,1 cm3/mol
Conductivitate termică
0,1 W/cm·K
Număr de oxidare
2, 3
Aplicații
Fermium is used for scientific research purposes only.
Fermium is harmful due to its radioactivity
Izotopi
Izotopi stabili
-Izotopi instabili
241Fm, 242Fm, 243Fm, 244Fm, 245Fm, 246Fm, 247Fm, 248Fm, 249Fm, 250Fm, 251Fm, 252Fm, 253Fm, 254Fm, 255Fm, 256Fm, 257Fm, 258Fm, 259Fm, 260Fm