Symbol	Bk
Atomic number	97
Group	-
Period	7
Block	f
Classification	Actinide

Appearance	Silvery
Color	-

Number of protons	97 p+
Number of neutrons	150 n0
Number of electrons	97 e-

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.

Phase at STP	Solid
Density	14.78 g/cm3
Atomic weight	247 u

Melting point	1259 K 985.85 °C 1806.53 °F
Boiling point	2900 K 2626.85 °C 4760.33 °F
Heat of vaporization	-

Electronegativity (Pauling Scale)	1.3
Electron affinity	-165.24 kJ/mol
Oxidation states	+2, +3, +4, +5 ()
Ionization energies	601 kJ/mol 1186 kJ/mol 2152 kJ/mol 3434 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f9 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f9 6s2 6p6 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f9 6s2 6p6 7s2
Electrons per shell	2, 8, 18, 32, 27, 8, 2
Valence electrons	2
Valency electrons	3,4
Bohr model	Figure: Shell diagram of Berkelium (Bk) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s

Discovery

Lawrence Berkeley National Laboratory (1949)

CAS Number	7440-40-6
ChemSpider ID	22409
EC number	-
PubChem CID Number	23971