64Gd157.25
Gadolinium (Gd)
Element 64 · Lanthanide
Gadolinium (Gd) is a chemical element with atomic number 64. It is classified as a lanthanide in period 6 of the periodic table (the f-block). Its standard atomic weight is 157.25 u and its ground-state electron configuration is [Xe] 4f⁷ 5d¹ 6s².
Gadolinium facts
| Atomic number (Z) | 64 |
|---|---|
| Symbol | Gd |
| Standard atomic weight | 157.25 u |
| Category | Lanthanide |
| Group | — (f-block) |
| Period | 6 |
| Block | f-block |
| Electron configuration | [Xe] 4f⁷ 5d¹ 6s² |
| Electronegativity (Pauling) | 1.2 |
| State at 20 °C | Solid |
| Protons / electrons | 64 / 64 |
| Neutrons (most common isotope, approx.) | 93 |
| Molar mass | 157.25 g/mol |