Atomic number 11 · alkali metal · Atomic mass 22.99 u
| Atomic Number | 11 |
| Atomic Mass | 22.9900 u |
| Category | alkali metal / 碱金属 |
| Group | 1 |
| Period | 3 |
| Block | S |
| Electron Configuration | [Ne] 3s¹ |
| Electronegativity (Pauling) | 0.93 |
| Phase at STP | Solid |
| Density | 0.968 g/cm³ |
| Year Discovered | 1807 |
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