Atomic number 89 · actinide · Atomic mass 227 u
| Atomic Number | 89 |
| Atomic Mass | 227.0000 u |
| Category | actinide / 锕系元素 |
| Group | 3 |
| Period | 7 |
| Block | D |
| Electron Configuration | [Rn] 6d¹ 7s² |
| Electronegativity (Pauling) | 1.1 |
| Phase at STP | Solid |
| Density | 10.07 g/cm³ |
| Year Discovered | 1899 |
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