Atomic number 17 · halogen · Atomic mass 35.45 u
| Atomic Number | 17 |
| Atomic Mass | 35.4500 u |
| Category | halogen / 卤素 |
| Group | 17 |
| Period | 3 |
| Block | P |
| Electron Configuration | [Ne] 3s² 3p⁵ |
| Electronegativity (Pauling) | 3.16 |
| Phase at STP | Gas |
| Density | 0.003214 g/cm³ |
| Year Discovered | 1774 |
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