Helium vs Silver
| Property | He Helium | Ag Silver |
|---|---|---|
| Atomic number | 2 | 47 |
| Symbol | He | Ag |
| Name | Helium | Silver |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 4.002602 u | 107.8682 u |
| Period | 1 | 5 |
| Group | 18 | 11 |
| Block | s | s |
| Phase at STP | gas | solid |
| Electron configuration | 1s2 | [Kr]5s14d10 |
| Oxidation states | [0] | [-2, -1, 0, 1, 2, 3] |
| Electronegativity (Pauling) | N/A | 1.93 |
| Electron affinity | -0.5 eV | 1.302 eV |
| Density | 0.1785 kg/m³ | 1.050100e+4 kg/m³ |
| Melting point | -272.2 °C | 961.78 °C |
| Boiling point | -268.93 °C | 2161.85 °C |
| Discovery year | 1868 | N/A |