Berkelium

Analytical testing dots

Berkelium is a synthetic element with the symbol Bk and atomic number 97. A radioactive metallic element in the actinide series, berkelium was first synthesized by bombarding americium with alpha particles (helium ions). Berkelium was the fifth transuranic element to be synthesized.

 

General
Name, Symbol, Number berkelium, Bk, 97
Chemical series Actinide
Group, Period, Block n/a, 7, f
Appearance unknown, probably silvery
white or metallic gray
Standard atomic weight (247) g·mol-1
Electrons per shell 2, 8, 18, 32, 27, 8, 2
Physical properties
Phase solid
Density (near r.t.) (alpha) 14.78 g·cm−3
Density (near r.t.) (beta) 13.25 g·cm−3
Melting point (beta) 1259K
(986°C, 1807°F)
Atomic properties
Oxidation states 3, 4
Electronegativity 1.3 (Pauling scale)
Ionization energies 1st: 601 kJ/mol
Miscellaneous
Crystal structure hexagonal close-packed
Magnetic ordering no data
Thermal conductivity (300K) 10 W·m-1·K-1
CAS registry number 7440-40-6

 

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