Symbol
Rf
Atomic Number
104
Atomic Mass
267
Protons
104
Neutrons
163
Electrons
104
Type
Transition Metal
Isotopes
Rutherfordium-267
Discovery Year
1964
Discovered By
A. G. B. Khiseng, G. N. Flerov, and others
Group
4
Period
7
Boiling Point
Unknown
Melting Point
2100°C
Electron Configuration
[Rn] 7s² 5f¹⁴ 6d²
Density (g/cm³)
17.4
Crystal Structure
Unknown
Magnetism
Unknown
Abundance in Earth's Crust
Trace
Phase at Room Temperature
Solid