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Lawrencium (Lr)
Atomic number 103 · Actinide
| Atomic number | 103 |
|---|---|
| Atomic mass | 262.0 u |
| Molar mass | 262.0 g/mol |
| Category | Actinide |
| Group / period / block | — / 7 / f |
| Electron configuration | [Rn] 5f14 7s2 7p1 |
| Electrons per shell | 2, 8, 18, 32, 32, 8, 3 |
| Density | 15.6 g/cm³ |
| First ionisation energy | 4.96 eV |
| Melting point | 1900.15 K (1627.00 °C) |
| Common oxidation states | +3 |
Uses
Research only — synthetic, made a few atoms at a time
Discovery
1961, A.Ghiorso, T.Sikkeland, A.E.Larsh, R.M.Latimer