Atomic number 55 · alkali metal · Atomic mass 132.91 u
| Atomic Number | 55 |
| Atomic Mass | 132.9100 u |
| Category | alkali metal / 碱金属 |
| Group | 1 |
| Period | 6 |
| Block | S |
| Electron Configuration | [Xe] 6s¹ |
| Electronegativity (Pauling) | 0.79 |
| Phase at STP | Solid |
| Density | 1.93 g/cm³ |
| Year Discovered | 1860 |
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