40
Zr
Zirconium
91.224 | 2
8
18
10
2
|
40
Zr
Zirconium
91.224 | 2
8
18
10
2
|
| General |
|---|
| Name | Zirconium | | Symbol | Zr | | Number | 40 | | Chemical series | Transition elements | | Group / Period | 4 / 5 | | Block | d-block | | CAS registry number | 7440-67-7 |
| Physical properties |
|---|
| State | solid | | Density | 6.52 g/cm3 | | Melting point | 2128 K (1855°C, 3371°F) | | Boiling point | 4682 K (4409°C, 7968°F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | 91.224 g/mol | | Crystal structure | hexagonal close-packed | | Electronegativity | 1.33 | | Atomic radius | 155 pm | | Atomic radius (calculated) | 206 pm | | Electron configuration | [Kr] 4d2 5s2 | | Electrons per shell | 2, 8, 18, 10, 2 | | Number of protons | 40 | | Number of neutrons | 51 |
|
Niobium