Rutherfordium

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

Property	Value
Atomic Number	104
Element	Rutherfordium
Symbol	Rf
Atomic Mass	[267] (most stable isotope)
Number of Neutrons	163 (Rutherfordium-267)
Number of Protons	104
Number of Electrons	104
Period	7
Group	4
Phase	Solid (predicted)
Radioactive	Yes
Natural	No (synthetic element)
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Transition Metal
Atomic Radius	~210 pm (estimated)
Electronegativity	— (not well established)
First Ionization Energy	~6.0 eV (estimated)
Density	~23 g/cm³ (estimated)
Melting Point	~2100 °C (estimated)
Boiling Point	~5500 °C (estimated)
Number of Isotopes	No stable isotopes (Rf-267 most notable)
Discoverer	Joint Institute for Nuclear Research (Dubna) and Lawrence Berkeley National Laboratory
Year	1964
Specific Heat	— (not well established)
Number of Shells	7
Number of Valence Electrons	4