Helium vs Nitrogen
| Property | He Helium | N Nitrogen |
|---|---|---|
| Atomic number | 2 | 7 |
| Symbol | He | N |
| Name | Helium | Nitrogen |
| Category | noble-gas | nonmetal |
| Standard Atomic Weight | 4.002602 u | 14.006855 u |
| Period | 1 | 2 |
| Group | 18 | 15 |
| Block | s | s |
| Phase at STP | gas | gas |
| Electron configuration | 1s2 | 2s2.2p3 |
| Oxidation states | [0] | [-3, -2, -1, 0, 1, 2, 3, 4, 5] |
| Electronegativity (Pauling) | N/A | 3.04 |
| Electron affinity | -0.5 eV | -0.07 eV |
| Density | 0.1785 kg/m³ | 1.2506 kg/m³ |
| Melting point | -272.2 °C | -210 °C |
| Boiling point | -268.93 °C | -195.79 °C |
| Discovery year | 1868 | 1772 |