Helium vs Carbon
| Property | He Helium | C Carbon |
|---|---|---|
| Atomic number | 2 | 6 |
| Symbol | He | C |
| Name | Helium | Carbon |
| Category | noble-gas | nonmetal |
| Standard Atomic Weight | 4.002602 u | 12.0106 u |
| Period | 1 | 2 |
| Group | 18 | 14 |
| Block | s | p |
| Phase at STP | gas | solid |
| Electron configuration | 1s2 | [He]2s22p2 |
| Oxidation states | [0] | [-4, -3, -2, -1, 0, 1, 2, 3, 4] |
| Electronegativity (Pauling) | N/A | 2.55 |
| Electron affinity | -0.5 eV | 1.2621 eV |
| Density | 0.1785 kg/m³ | 2267 kg/m³ |
| Melting point | -272.2 °C | 3549.85 °C |
| Boiling point | -268.93 °C | 3824.85 °C |
| Discovery year | 1868 | 1797 |