Helium vs Platinum
| Property | He Helium | Pt Platinum |
|---|---|---|
| Atomic number | 2 | 78 |
| Symbol | He | Pt |
| Name | Helium | Platinum |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 4.002602 u | 195.084 u |
| Period | 1 | 6 |
| Group | 18 | 10 |
| Block | s | s |
| Phase at STP | gas | solid |
| Electron configuration | 1s2 | [Xe]6s14f145d9 |
| Oxidation states | [0] | [-3, -2, -1, 0, 1, 2, 3, 4, 5, 6] |
| Electronegativity (Pauling) | N/A | 2.28 |
| Electron affinity | -0.5 eV | 2.1228 eV |
| Density | 0.1785 kg/m³ | 2.146000e+4 kg/m³ |
| Melting point | -272.2 °C | 1768.4 °C |
| Boiling point | -268.93 °C | 3824.85 °C |
| Discovery year | 1868 | 1735 |