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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

Atomic number97
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

Atomic properties

Electronegativity (Pauling Scale)1.3
Electron affinity-165.24 kJ/mol
Oxidation states+2, +3, +4, +5
Ionization energies
1601 kJ/mol
21186 kJ/mol
32152 kJ/mol
43434 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f9 7s2
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


Discovered byLawrence Berkeley National Laboratory
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