40Zr91.224
Zirconium (Zr)
Element 40 Ā· Transition metal
Zirconium (Zr) is a chemical element with atomic number 40. It is classified as a transition metal in period 5, group 4 of the periodic table (the d-block). Its standard atomic weight is 91.224 u and its ground-state electron configuration is [Kr] 4dĀ² 5sĀ².
Zirconium facts
| Atomic number (Z) | 40 |
|---|---|
| Symbol | Zr |
| Standard atomic weight | 91.224 u |
| Category | Transition metal |
| Group | 4 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 4dĀ² 5sĀ² |
| Electronegativity (Pauling) | 1.33 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 40 / 40 |
| Neutrons (most common isotope, approx.) | 51 |
| Molar mass | 91.224 g/mol |