Helium vs Gold
| Property | He Helium | Au Gold |
|---|---|---|
| Atomic number | 2 | 79 |
| Symbol | He | Au |
| Name | Helium | Gold |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 4.002602 u | 196.966569 u |
| Period | 1 | 6 |
| Group | 18 | 11 |
| Block | s | s |
| Phase at STP | gas | solid |
| Electron configuration | 1s2 | [Xe]6s14f145d10 |
| Oxidation states | [0] | [-3, -2, -1, 0, 1, 2, 3, 5] |
| Electronegativity (Pauling) | N/A | 2.54 |
| Electron affinity | -0.5 eV | 2.3086 eV |
| Density | 0.1785 kg/m³ | 1.928200e+4 kg/m³ |
| Melting point | -272.2 °C | 1064.18 °C |
| Boiling point | -268.93 °C | 2855.85 °C |
| Discovery year | 1868 | N/A |