Berkeliu
97
Bk
Grupă
n/a
Perioadă
7
Bloc
f
Protoni
Electroni
Neutroni
97
97
150
Proprietăți Generale
Număr atomic
97
Masă atomică
[247]
Numar de masa
247
Categorie
Actinide
Culoare
n/a
Radioactive
Da
Numit după Berkeley, California, orașul descoperii
Structură cristalină
Sistemul Hexagonal
Istoric
Berkelium was discovered by Glenn T. Seaborg, Albert Ghiorso and Stanley G. Thompson in 1949 at the University of California, Berkeley.
It was produced by the bombardment of americium with alpha particles.
Berkelium was isolated in greater quantities for the first time by Burris Cunningham and Stanley Thompson in 1958.
It was produced by the bombardment of americium with alpha particles.
Berkelium was isolated in greater quantities for the first time by Burris Cunningham and Stanley Thompson in 1958.
Electroni pe nivelul de energie
2, 8, 18, 32, 27, 8, 2
Configurație electronică
[Rn] 5f9 7s2
Just over one gram of berkelium has been produced in the United States since 1967
Proprietăți Fizice
Fază
Solid
Densitate
14,78 g/cm3
Punct de topire
1259,15 K | 986 °C | 1806,8 °F
Punct de fierbere
3173,15 K | 2900 °C | 5252 °F
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 (Department of Energy - Office of Public Affairs)
The 60-inch cyclotron at the Lawrence Radiation Laboratory, University of California, Berkeley
Numarul CAS
7440-40-6
Număr CID PubChem
23971
Proprietăți Atomice
Rază atomică
170 pm
Rază de covalență
-
Electronegativitate
1,3 (Scara lui Pauling)
Potențial de ionizare
6,1979 eV
Volum molar
16,7 cm3/mol
Conductivitate termică
0,1 W/cm·K
Număr de oxidare
3, 4
Aplicații
Berkelium is mainly used for scientific research purposes.
Berkelium-249 is a common target nuclide to prepare still heavier transuranic elements and transactinides, such as lawrencium, rutherfordium and bohrium.
It is also useful as a source of the isotope californium-249.
Berkelium-249 is a common target nuclide to prepare still heavier transuranic elements and transactinides, such as lawrencium, rutherfordium and bohrium.
It is also useful as a source of the isotope californium-249.
Berkelium is harmful due to its radioactivity
Izotopi
Izotopi stabili
-Izotopi instabili
233Bk, 235Bk, 236Bk, 237Bk, 238Bk, 239Bk, 240Bk, 241Bk, 242Bk, 243Bk, 244Bk, 245Bk, 246Bk, 247Bk, 248Bk, 249Bk, 250Bk, 251Bk, 252Bk, 253Bk, 254Bk