Berkelium

Chaitra 26/06/2026 19:58:09 Updated 26/06/2026 19:58:09

Property	Value
Atomic Number	97
Element	Berkelium
Symbol	Bk
Atomic Mass	[247] (most stable isotope)
Number of Neutrons	150 (Berkelium-247)
Number of Protons	97
Number of Electrons	97
Period	7
Group	Actinide (no fixed group number)
Phase	Solid
Radioactive	Yes
Natural	No (synthetic element)
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Actinide
Atomic Radius	~170 pm (estimated)
Electronegativity	1.30 (estimated)
First Ionization Energy	6.23 eV (estimated)
Density	14.78 g/cm³ (estimated)
Melting Point	986 °C
Boiling Point	~2627 °C (estimated)
Number of Isotopes	No stable isotopes (Bk-247 most notable)
Discoverer	Glenn T. Seaborg, Stanley G. Thompson, Albert Ghiorso
Year	1949
Specific Heat	— (not well established)
Number of Shells	7
Number of Valence Electrons	3