72
Hf
Hafnium
178.49 | 2
8
18
32
10
2
|
72
Hf
Hafnium
178.49 | 2
8
18
32
10
2
|
| General |
|---|
| Name | Hafnium | | Symbol | Hf | | Number | 72 | | Chemical series | Transition elements | | Group / Period | 4 / 6 | | Block | d-block | | CAS registry number | 7440-58-6 |
| Physical properties |
|---|
| State | solid | | Density | 13.31 g/cm3 | | Melting point | 2506 K (2233 °C, 4051 °F) | | Boiling point | 4876 K (4603 °C, 8317 °F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | 178.49 g/mol | | Crystal structure | hexagonal | | Electronegativity | 1.30 | | Atomic radius | 155 pm | | Atomic radius (calculated) | 208 pm | | Electron configuration | [Xe] 4f14 5d2 6s2 | | Electrons per shell | 2, 8, 18, 32, 10, 2 | | Number of protons | 72 | | Number of neutrons | 106 |
|
Tantalum