| From Wikipedia, the free encyclopediaRutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, 267Rf, has a half-life of approximately 1.3 hours. In the periodic table of the elements, it is a d - block element and the second of the fourth - row transition elements. | |||
Rutherfordium in the periodic table | |||
|---|---|---|---|
| Symbol | Rf | ||
| Atomic number | 104 | ||
| Group | 4 | ||
| Period | 7 | ||
| Block | d | ||
| Element category | Transition Metal | ||
Physical properties | |||
| Phase at STP | Solid | ||
| Density | 23.2 g/cm3 | ||
| Atomic weight | 267 u | ||
| Melting point | 2400 K 2126.85 °C 3860.33 °F | ||
| Boiling point | 5800 K 5526.85 °C 9980.33 °F | ||
Atomära egenskaper | |||
| Electronegativity (Pauling Scale) | |||
| Electron affinity | kJ/mol | ||
| Ionization energies |
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Electron configuration | |||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d2 7s2 | ||
| Electrons per shell | 2, 8, 18, 32, 32, 10, 2 | ||
History | |||
| Discovered | 1969 | ||
| Discovered by | Joint Institute for Nuclear Research | ||