Berkelium

Atomic properties
Atomic number	97
Electron configuration	[Rn] 5f9 7s2
Physical properties
Melting point	1259 K (986 °C)
Chemical properties
Electronegativity	1.3 (Pauling)
Ionization energy
	6.26 eV; 601 kJ mol−1
Atomic radii
Ionic radius	110 pm (Bk3+, Oh); 97 pm (Bk4+, Oh)
Thermodynamic properties
Enthalpy change of atomization	142(13) kJ mol−1
Entropy change of atomization	98(13) J K−1 mol−1
Miscellaneous
CAS number	7440-40-6
	Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).
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curium ← berkelium → californium

Tb
↑
Bk
↓
–

Berkelium (symbol: Bk) is a synthetic chemical element and a member of the actinoid series. It is named after the city of Berkeley, California, the location of the University of California Radiation Laboratory where it was discovered in 1949.

Notes and references

↑ Pauling, Linus The Nature of the Chemical Bond, 3rd ed.; Ithaca, NY, 1960. ISBN 0-8014-0333-2.

See also the corresponding article on Wikipedia.

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