Protactinium
Electron Configuration
|
General Properties
| Atomic Symbol | Pa |
| Atomic Weight | 231.00 g/mol |
| Element Number | 91 |
| Standard State | Solid |
| Standard Type | Strongly Basic |
| Date of Discovery | 1917 |
| Discoverer | Hahn & Meitner |
Physical Properties
| Oxidation States | 5, 4 |
| Boiling Point | 4300 K |
| Melting Point | 1845 K |
| Density | 15.4 g/cm³ |
| Electron Configuration | [Rn]5f2,6d1,7s2 |
| Acid/Base Properties | Basic |
| Crystal Structure | Orthorhombic |
| Electronegativity | 1.5 |
| Heat of Vaporization | -- |
| Heat of Fusion | -- |
| Electrical Conductivity | 5.6 10^6omg-¹cm-¹ |
| Thermal Conductivity | 47 Wm-¹K-¹ (at 300 K) |
| Specific Heat Capacity | -- |
| First Ionization Potential | 5.88 |
| Atomic Volume | 15.0 cm³/mol |
| Atomic Radius | 1.61 Å |
| Covalent Radius | -- |
| Synthetic | No |