Atomic number 9 · halogen · Atomic mass 18.998 u
| Atomic Number | 9 |
| Atomic Mass | 18.9980 u |
| Category | halogen / 卤素 |
| Group | 17 |
| Period | 2 |
| Block | P |
| Electron Configuration | [He] 2s² 2p⁵ |
| Electronegativity (Pauling) | 3.98 |
| Phase at STP | Gas |
| Density | 0.001696 g/cm³ |
| Year Discovered | 1886 |
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