Rutherfordium was first discovered in 1964 at the Joint Institute of Nuclear Research at Dubna, Russia by bombarding a plutonium-242 target with neon-22 ions.
Atomic number: 104
Atomic weight: 265.12
State: solid presumably
Group, period, block: 4, 7, d
Classification: transition metal
Electron configuration: 5f14 6d2 7s2
Density: 23 g/cm-3
Melting point: 2400 K,2100 °C,3800 (estimated) °F
Boiling point: 5800 K,5500 °C,9900 (estimated) °F
Oxidation states: 4, 3 (predicted)
Electronegativity: no data
Ionization energies: 1st: 579.9 (estimated) kJ·mol-1
Covalent radius: 157 (estimated) pm
Van der Waals radius: 187 pm
Rutherfordium has no stable or naturally-occurring isotopes. Several radioactive isotopes have been synthesized in the laboratory.