Atomic number 2 · noble gas · Atomic mass 4.0026 u
| Atomic Number | 2 |
| Atomic Mass | 4.0026 u |
| Category | noble gas / 稀有气体 |
| Group | 18 |
| Period | 1 |
| Block | S |
| Electron Configuration | 1s² |
| Electronegativity (Pauling) | — |
| Phase at STP | Gas |
| Density | 0.0001785 g/cm³ |
| Year Discovered | 1868 |
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