Rutherfordium (Rf) – element 104
Rutherfordium is a chemical element with the symbol Rf and atomic number 104. It is a transition metal in group 4, period 7 of the periodic table (d-block), and is a solid at room temperature.
Rutherfordium (Rf) has atomic number 104, atomic mass [267] and electron configuration [Rn] 5f14 6d2 7s2.
Rutherfordium facts
| Symbol | Rf |
|---|---|
| Atomic number | 104 |
| Atomic mass | [267] |
| Category | transition metal |
| Group | group 4 |
| Period | 7 |
| Block | d-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d2 |
| Noble-gas notation | [Rn] 5f14 6d2 7s2 |
| Electrons per shell | 2, 8, 18, 32, 32, 10, 2 |
Bohr model and shells
Rutherfordium has 104 electrons in 7 shells: 2, 8, 18, 32, 32, 10, 2. Full configuration and noble-gas notation are in the table; work out any element or ion with the electron configuration calculator.
Physical and atomic properties
| Melting point | 2400 K (2126.8 °C) |
|---|---|
| Boiling point | 5800 K (5526.9 °C) |
| Density | 23.2 g/cm³ |
| Ionization energies | 580 kJ/mol (1st) |
| Discovered by | Joint Institute for Nuclear Research |
Use the atomic mass in the molar mass calculator for any formula containing Rf.
Position in the periodic table
Tap any element to open its page.
Frequently asked questions
What is the atomic mass of rutherfordium?
The atomic mass of rutherfordium is [267] (mass number of its longest-lived isotope, since it has no stable isotope).
What is the electron configuration of rutherfordium?
Rutherfordium has 104 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d², or [Rn] 5f¹⁴ 6d² 7s² in noble-gas notation. Electrons per shell: 2, 8, 18, 32, 32, 10, 2.
Is rutherfordium a metal?
Yes. Rutherfordium is a transition metal.
Where is rutherfordium on the periodic table?
Rutherfordium is in group 4, period 7, in the d-block.
Data: Periodic-Table-JSON (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.