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104
Rf
[267]
Rutherfordium
Transition metals · Group 4 · Period 7
Atomic properties
| Atomic number | 104 |
|---|---|
| Symbol | Rf |
| Standard atomic weight | [267] |
| Classification | Transition metals |
| Group | 4 |
| Period | 7 |
| Block | d-block |
| Electron configuration | [Rn] 5f14 6d2 7s2 |
| Electronegativity (Pauling) | — |
| Common oxidation states | +4 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 23.2 g/cm³ |
| Melting point | 2100 °C |
| Boiling point | 5500 °C |
| Discovered | 1964 |
| CAS number | — |