Atomic number 103 · actinide · Atomic mass 266 u
| Atomic Number | 103 |
| Atomic Mass | 266.0000 u |
| Category | actinide / 锕系元素 |
| Group | 3 |
| Period | 7 |
| Block | D |
| Electron Configuration | [Rn] 5f¹⁴ 7s² 7p¹ |
| Electronegativity (Pauling) | 1.3 |
| Phase at STP | Solid |
| Density | 14.4 g/cm³ |
| Year Discovered | 1961 |
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