Berkelium



Bk redirects here. For other uses of the abbreviation, see BK.

97 californium
Tb
↑
Bk
↓
(Uqs)
General
Number berkelium, Bk, 97
Actinide
Block f
Appearance unknown, probably silvery
white or metallic gray
Standard atomic weight (247)  g·mol−1
Rn] 5f9 7s2
shell 2, 8, 18, 32, 27, 8, 2
Physical properties
Phase solid
r.t.) (alpha) 14.78  g·cm−3
r.t.) (beta) 13.25  g·cm−3
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 (300 K) 10  W·m−1·K−1
CAS registry number 7440-40-6
Selected isotopes
Main article: Isotopes of berkelium
iso NA half-life DM DE (MeV) DP
245Bk syn 4.94 d ε 0.810 245Cm
α 6.455 241Am
246Bk syn 1.8 d α 6.070 242Am
ε 1.350 246Cm
247Bk syn 1380 y α 5.889 243Am
248Bk syn >9 y α 5.803 244Am
249Bk syn 330 d α 5.526 245Am
SF - -
β- 0.125 249Cf
References

Berkelium (transuranic element to be synthesized.

Contents

Notable characteristics

Weighable amounts of 249Bk (half-life 314 days) make it possible to determine some of its properties using macroscopic quantities. As of 2004 it had not been isolated in its elemental form, but it is predicted to be a silvery metal that would easily soluble in dilute mineral acids.

X-ray diffraction techniques have been used to identify various berkelium gram. This was the first time visible amounts of a pure berkelium compound were produced.

Like other actinides, berkelium bio-accumulates in skeletal tissue.[citation needed] This element has no known uses outside of basic research and plays no biological role.

History

Berkelium was neutrons.

Isotopes

19 u (235Bk) to 254.091 u (254Bk).

References

  • Los Alamos National Laboratory - Berkelium
  • It's Elemental - Berkelium
 
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