Berkelium (Bk)

From Wikipedia, the free encyclopediaBerkelium is a transuranic radioactive chemical element with symbol Bk and atomic number 97. It is a member of the actinide and transuranium element series. It is named after the city of Berkeley, California, the location of the University of California Radiation Laboratory where it was discovered in December 1949.

Berkelium in the periodic table

SymbolBk
Atomic number97
Group0
Period7
Blockf
Element categoryActinide

Physical properties

Phase at STPSolid
Density14.78 g/cm3
Atomic weight247 u
Melting point1259 K
985.85 °C
1806.53 °F
Boiling point2900 K
2626.85 °C
4760.33 °F

Atomära egenskaper

Electronegativity (Pauling Scale)1.3
Electron affinity-165.24 kJ/mol
Ionization energies
1601 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f9 6s2 6p6 7s2
Electrons per shell2, 8, 18, 32, 27, 8, 2

History

Discovered1949
Discovered byLawrence Berkeley National Laboratory