The first lanthanide and the element that hid inside cerium for 36 years before anyone noticed.
- Atomic number
- 57
- Atomic mass
- 138.905 u
- Phase
- Solid
- Electron configuration
- [Xe] 5d¹ 6s²
- Melting point
- 1,193 K · 919.9 °C
- Boiling point
- 3,737 K · 3,463.9 °C
- Density
- 6.162 g/cm³
- Electronegativity
- 1.1
- Period / Group
- 6 / —
- Discovery year
- 1839