Iron vs Protactinium
| Property | Fe Iron | Pa Protactinium |
|---|---|---|
| Atomic number | 26 | 91 |
| Symbol | Fe | Pa |
| Name | Iron | Protactinium |
| Category | transition-metal | actinide |
| Standard Atomic Weight | 55.845 u | 231.03588 u |
| Period | 4 | 7 |
| Group | 8 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d6 | [Rn]7s25f26d1 |
| Oxidation states | [-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7] | [2, 3, 4, 5] |
| Electronegativity (Pauling) | 1.83 | 1.5 |
| Electron affinity | 0.151 eV | 0.123 eV |
| Density | 7874 kg/m³ | 1.537000e+4 kg/m³ |
| Melting point | 1537.85 °C | 1571.85 °C |
| Boiling point | 2860.85 °C | -273.15 °C |
| Discovery year | N/A | 1913 |