Atomic number 3 · alkali metal · Atomic mass 6.94 u
| Atomic Number | 3 |
| Atomic Mass | 6.9400 u |
| Category | alkali metal / 碱金属 |
| Group | 1 |
| Period | 2 |
| Block | S |
| Electron Configuration | [He] 2s¹ |
| Electronegativity (Pauling) | 0.98 |
| Phase at STP | Solid |
| Density | 0.534 g/cm³ |
| Year Discovered | 1817 |
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