Properties | |
| Atomic Number: | 89 |
| Atomic Weight: | (227) |
| Electron Configuration (at ground state): | 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p66d17s2 |
| Oxidation States (Bold most stable): | +3 |
| Boiling Point (K): | 3470 |
| Melting Point (K): | 1324 |
| Density (at 300K -- g/cm3): | 10.07 |
| Atomic Volume (at 300K -- cm3/mol) | 22.5 |
| Number of natural radioactive isotopes: | 2 |
| Mass Number (Bold naturally occurring) -- Half-Life -- Disintigration Type: |
227 -- 21.77 years --
beta particle (electron) emission |
| Atomic Radius (Å): | 1.88 |
| First Ionization Potential (V): | 5.17 |
| Electronegativity (Pauling's): | 1.1 |
| Specific Heat Capacity (at 300K -- J g-1 K-1): | 0.120 |
| Thermal Conductivity (at 300K -- W m-1 K-1): | 12 |
| Crystal Structure: |  Cubic, face centered |