Helium vs Bismuth
| Property | He Helium | Bi Bismuth |
|---|---|---|
| Atomic number | 2 | 83 |
| Symbol | He | Bi |
| Name | Helium | Bismuth |
| Category | noble-gas | post-transition-metal |
| Standard Atomic Weight | 4.002602 u | 208.9804 u |
| Period | 1 | 6 |
| Group | 18 | 15 |
| Block | s | p |
| Phase at STP | gas | solid |
| Electron configuration | 1s2 | [Xe]6s24f145d106p3 |
| Oxidation states | [0] | [-3, -2, -1, 0, 1, 2, 3, 4, 5] |
| Electronegativity (Pauling) | N/A | 2.02 |
| Electron affinity | -0.5 eV | 0.942 eV |
| Density | 0.1785 kg/m³ | 9807 kg/m³ |
| Melting point | -272.2 °C | 271.4 °C |
| Boiling point | -268.93 °C | 1563.85 °C |
| Discovery year | 1868 | 1753 |