Rutherfordium
transition metalProperties
| Property | Value |
|---|---|
| Atomic Mass | 267 amu |
| Category | transition metal |
| Group | 4 |
| Period | 7 |
| Electron Configuration | [Rn] 5f14 6d2 7s2 |
| Oxidation States | 4 |
| Discovered By | Joint Institute for Nuclear Research (Dubna), Lawrence Berkeley National Laboratory (1969) |
About Rutherfordium
Rutherfordium is the first transactinide — element 104, sitting just below hafnium in group 4 — and it exists only as a few atoms at a time, made by slamming Cm-248 with O-18 (or similar nuclear cocktails) at heavy-ion accelerators. The most stable known isotope, Rf-267, sticks around for roughly 1.3 hours, which is luxuriously long by superheavy standards and just enough time to do real chemistry on it. Experimenters use gas-phase chromatography on single atoms: form a chloride or bromide, watch how it sticks to a quartz column, and compare with hafnium and zirconium tracers run alongside. The result is broadly group-4 behaviour — RfCl₄ volatility tracks Hf and Zr — but with quiet deviations that hint at relativistic effects creeping into the 6d and 7s shells. Naming it took longer than synthesizing it: the Dubna and Berkeley teams fought over priority through the 'Transfermium Wars' until IUPAC settled on rutherfordium in 1997, honouring the man who discovered the nucleus this whole field depends on.
Fun Fact
Rutherfordium's naming was part of the 'Transfermium Wars' — a decades-long dispute between American and Soviet scientists over who deserved credit for discovering elements 104 through 109, not resolved until 1997.
Common Uses
- Single-atom gas-phase chromatography to test group 4 periodic trends
- Probing relativistic effects on 6d-shell chemistry
- Calibrating heavy-ion fusion-evaporation cross-section models
- Benchmarking superheavy-element decay chain identification
- Reference point for predicted chemistry of elements 105 and beyond
- No commercial or industrial applications