Sodium vs Protactinium
| Property | Na Sodium | Pa Protactinium |
|---|---|---|
| Atomic number | 11 | 91 |
| Symbol | Na | Pa |
| Name | Sodium | Protactinium |
| Category | alkali-metal | actinide |
| Standard Atomic Weight | 22.989769 u | 231.03588 u |
| Period | 3 | 7 |
| Group | 1 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ne]3s1 | [Rn]7s25f26d1 |
| Oxidation states | [-1, 0, 1] | [2, 3, 4, 5] |
| Electronegativity (Pauling) | 0.93 | 1.5 |
| Electron affinity | 0.5479 eV | 0.123 eV |
| Density | 970 kg/m³ | 1.537000e+4 kg/m³ |
| Melting point | 97.8 °C | 1571.85 °C |
| Boiling point | 882.85 °C | -273.15 °C |
| Discovery year | 1807 | 1913 |