Helium vs Iron
| Property | He Helium | Fe Iron |
|---|---|---|
| Atomic number | 2 | 26 |
| Symbol | He | Fe |
| Name | Helium | Iron |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 4.002602 u | 55.845 u |
| Period | 1 | 4 |
| Group | 18 | 8 |
| Block | s | s |
| Phase at STP | gas | solid |
| Electron configuration | 1s2 | [Ar]4s23d6 |
| Oxidation states | [0] | [-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | N/A | 1.83 |
| Electron affinity | -0.5 eV | 0.151 eV |
| Density | 0.1785 kg/m³ | 7874 kg/m³ |
| Melting point | -272.2 °C | 1537.85 °C |
| Boiling point | -268.93 °C | 2860.85 °C |
| Discovery year | 1868 | N/A |