Atomic number 18 · noble gas · Atomic mass 39.95 u
| Atomic Number | 18 |
| Atomic Mass | 39.9500 u |
| Category | noble gas / 稀有气体 |
| Group | 18 |
| Period | 3 |
| Block | P |
| Electron Configuration | [Ne] 3s² 3p⁶ |
| Electronegativity (Pauling) | — |
| Phase at STP | Gas |
| Density | 0.001784 g/cm³ |
| Year Discovered | 1894 |
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