Quick Facts
| Property | Value |
|---|---|
| Symbol | Lr |
| Atomic Number | 103 |
| Atomic Mass | [266] u |
| Category | Actinide |
| Period | 7 |
| Group | 3 |
| Block | d |
| Electron Configuration | [Rn] 5f¹⁴ 7s² 7p¹ |
History and Discovery
Discovered by: Albert Ghiorso and colleagues Year of Discovery: 1961 Location: Berkeley, California, USA
Etymology
Named after Ernest Lawrence, inventor of the cyclotron.
Interesting Facts
- Final element of the actinide series
- Named after the inventor of the cyclotron
- Most stable isotope has 11-hour half-life
- First of the "transactinide" elements
- Produced by bombarding californium with boron