Atomic number 57 · lanthanide · Atomic mass 138.91 u
| Atomic Number | 57 |
| Atomic Mass | 138.9100 u |
| Category | lanthanide / 镧系元素 |
| Group | 3 |
| Period | 6 |
| Block | D |
| Electron Configuration | [Xe] 5d¹ 6s² |
| Electronegativity (Pauling) | 1.1 |
| Phase at STP | Solid |
| Density | 6.162 g/cm³ |
| Year Discovered | 1839 |
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