Atomic number 19 · alkali metal · Atomic mass 39.098 u
| Atomic Number | 19 |
| Atomic Mass | 39.0980 u |
| Category | alkali metal / 碱金属 |
| Group | 1 |
| Period | 4 |
| Block | S |
| Electron Configuration | [Ar] 4s¹ |
| Electronegativity (Pauling) | 0.82 |
| Phase at STP | Solid |
| Density | 0.856 g/cm³ |
| Year Discovered | 1807 |
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