Element 104
Rutherfordium (Rf)
Rutherfordium (Rf) is element 104 of the periodic table, a transition metal in period 7, group 4 (d-block) with an atomic mass of 267 and is a solid at standard conditions.
At a glance
- Atomic number
- 104
- Symbol
- Rf
- Atomic mass
- 267 u
- Category
- Transition metals
- Period
- 7
- Group
- 4
- Block
- d-block
- Phase at STP
- solid
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 6d2 7s2
- Shorthand configuration
- [Rn] 5f14 6d2 7s2
- Electrons per shell
- 2, 8, 18, 32, 32, 10, 2
- Oxidation states
- +4
Physical properties
- Melting point
- 2400 K
- Boiling point
- 5800 K
- Density
- 23.2 g/cm3
- Phase
- solid
Atomic properties
- Covalent radius
- 157 pm
- First ionization energy
- 580 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Rf-267 | 267.12179 | — | Half-life 1.3 hours |
Common uses
- Scientific research only
Discovery
- Year
- 1964
- Discovered by
- Joint Institute for Nuclear Research, Lawrence Berkeley Laboratory
- Country
- Russia/USA