28Ni58.693
Nickel (Ni)
Element 28 Ā· Transition metal
Nickel (Ni) is a chemical element with atomic number 28. It is classified as a transition metal in period 4, group 10 of the periodic table (the d-block). Its standard atomic weight is 58.693 u and its ground-state electron configuration is [Ar] 3dāø 4sĀ².
Nickel facts
| Atomic number (Z) | 28 |
|---|---|
| Symbol | Ni |
| Standard atomic weight | 58.693 u |
| Category | Transition metal |
| Group | 10 |
| Period | 4 |
| Block | d-block |
| Electron configuration | [Ar] 3dāø 4sĀ² |
| Electronegativity (Pauling) | 1.91 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 28 / 28 |
| Neutrons (most common isotope, approx.) | 31 |
| Molar mass | 58.693 g/mol |