58Ce140.12
Cerium (Ce)
Element 58 · Lanthanide
Cerium (Ce) is a chemical element with atomic number 58. It is classified as a lanthanide in period 6 of the periodic table (the f-block). Its standard atomic weight is 140.12 u and its ground-state electron configuration is [Xe] 4f¹ 5d¹ 6s².
Cerium facts
| Atomic number (Z) | 58 |
|---|---|
| Symbol | Ce |
| Standard atomic weight | 140.12 u |
| Category | Lanthanide |
| Group | — (f-block) |
| Period | 6 |
| Block | f-block |
| Electron configuration | [Xe] 4f¹ 5d¹ 6s² |
| Electronegativity (Pauling) | 1.12 |
| State at 20 °C | Solid |
| Protons / electrons | 58 / 58 |
| Neutrons (most common isotope, approx.) | 82 |
| Molar mass | 140.12 g/mol |