Atomic number 61 · lanthanide · Atomic mass 145 u
| Atomic Number | 61 |
| Atomic Mass | 145.0000 u |
| Category | lanthanide / 镧系元素 |
| Group | — |
| Period | 6 |
| Block | F |
| Electron Configuration | [Xe] 4f⁵ 6s² |
| Electronegativity (Pauling) | 1.13 |
| Phase at STP | Solid |
| Density | 7.26 g/cm³ |
| Year Discovered | 1945 |
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