Berkelyo

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Berkelium
97Bk
Tb

Bk

(Uqe)
curiumberkeliumcalifornium
Appearance
silvery
General properties
Name, simbolo, kaiphan berkelium, Bk, 97
Pronunciation Plantilya:IPAc-en
Plantilya:Respell
less commonly
Plantilya:IPAc-en
Plantilya:Respell
Element category aktinido
Group, period, block n/a7, f
Standard atomic weight (247)
Electron configuration [Rn] 5f9 7s2
2, 8, 18, 32, 27, 8, 2
Electron shells of berkelium (2, 8, 18, 32, 27, 8, 2)
History
Discovery Lawrence Berkeley National Laboratory (1949)
Physical properties
Phase magahi
Density (near r.t.) (alpha) 14.78 g·cm−3
Density (near r.t.) (beta) 13.25 g·cm−3
Melting point (beta) 1259 K, 986 °C, 1807 °F
Atomic properties
Oxidation states 3, 4
Electronegativity 1.3 (Pauling scale)
Ionization energies 1st: 601 kJ·mol−1
Atomic radius 170 pm
Miscellanea
Crystal structure hexagonal close-packed
Berkelium has a hexagonal close-packed crystal structure
Magnetic ordering paramagnetic
Thermal conductivity 10 W·m−1·K−1
CAS registry number 7440-40-6
Most stable 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 trace 330 d α 5.526 245Am
SF - -
β 0.125 249Cf
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Ang berkelyo (Iningles berkelium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Bk ug kaiphan nga atomik 97. Ang berkelyo mao ang aktinido.

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