Cerium (Ce)
Cerium
Cerium (Ce) is a lanthanide in period 6. Its relative atomic mass is 140.12 and the molar mass of the atom is 140.12 g/mol.
Atomic number 58
Atomic mass 140.12
Molar mass 140.12 g/mol
Category Lanthanide Solid
Properties of cerium
| Atomic number | 58 |
|---|---|
| Symbol | Ce |
| Latin name | Cerium |
| Relative atomic mass | 140.12 |
| Molar mass | 140.12 g/mol |
| Group, period, block | —, 6, f |
| Category | Lanthanide |
| State at 20 °C | Solid |
| Electron configuration | [Xe] 4f¹ 5d¹ 6s² |
| Electronegativity (Pauling) | 1.12 |
| Atomic radius | 185 pm |
Electron configuration of cerium
Electrons per shell
K2L8M18N19O9P2
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹ 5s² 5p⁶ 5d¹ 6s²
Noble-gas notation
58 protons · 58 electrons[Xe] 4f¹ 5d¹ 6s²
Formula and compounds of cerium
Simple substanceCeceriumMolar mass of Ce: 140.12 g/mol
Chemistry not clicking? Try a lesson with a tutor
1-to-1 online chemistry lessons for KS3, GCSE and A-level. Your first lesson is a free trial.
Frequently asked questions
The relative atomic mass of cerium is 140.12, so the molar mass of the atom is 140.12 g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹ 5s² 5p⁶ 5d¹ 6s². Noble-gas notation: [Xe] 4f¹ 5d¹ 6s².