103Lr[266]
Lawrencium
ActinidesHeavy, radioactive metals. Most of them are made only in laboratories.
[Rn] 5f¹⁴ 7s² 7p¹
- Atomic number
- 103
- Atomic mass
- [266]
- Protons
- 103
- Neutrons
- 163
- Electrons
- 103
- Shells
- 2, 8, 18, 32, 32, 8, 3
- State at 25 °C
- Solid
- Position
- Period 7, f-block
Proton (+)Neutron (0)Electron (−)
Discovered byAlbert Ghiorso's team at Berkeley, 1961Albert Ghiorso: 12 elements
Named after Ernest Lawrence, who invented the cyclotron particle accelerator.
Did you know?
- It completes the actinide series.
- Its electron arrangement surprised scientists.
Where it's found
- Made only in laboratories, a few atoms at a time
What it's used for
- Scientific research only
Try it
There's no safe home experiment for Lawrencium. Explore it with the animated atom above instead.