Template:Infobox berkelium

Berkelium,  ₉₇Bk

General properties
Name, symbol	berkelium, Bk
Appearance	silvery
Pronunciation	/bərˈkiːli.əm/; less commonly: /ˈbɜːrkli.əm/ bər-KEE-lee-əm; BERK-lee-əm
Berkelium in the periodic table
Tb ↑ Bk ↓ (Uqe) curium ← berkelium → californium
Atomic number (Z)	97
Group, block	group n/a, f-block
Period	period 7
Element category	actinide
Standard atomic weight (Ar)	(247)
Electron configuration	[Rn] 5f9 7s2
per shell	2, 8, 18, 32, 27, 8, 2
Physical properties
Phase	solid
Melting point	beta: 1259 K ​(986 °C, ​1807 °F)
Boiling point	beta: 2900 K ​(2627 °C, ​4760 °F)
Density near r.t.	alpha: 14.78 g/cm3 beta: 13.25 g/cm3
Heat of fusion	7.92 kJ/mol (calculated)
Atomic properties
Oxidation states	2, 3, 4
Electronegativity	Pauling scale: 1.3
Ionization energies	1st: 601 kJ/mol
Atomic radius	empirical: 170 pm
Miscellanea
Crystal structure	​double hexagonal close-packed (dhcp)
Thermal conductivity	10 W/(m·K)
Magnetic ordering	paramagnetic
CAS Number	7440-40-6
History
Naming	after Berkeley, California, where it was discovered
Discovery	Lawrence Berkeley National Laboratory (1949)
Most stable 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 >300 y α 5.803 244Am 249Bk syn 330 d α 5.526 245Am SF – – β− 0.125 249Cf

References

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