Properties | |
| Atomic Number: | 92 |
| Atomic Weight: | 238.029 |
| Electron Configuration (at ground state): | 1s22s22p63s23p63d104s24p64d105s25p64f145d105f36s26p66d17s2 |
| Oxidation States (Bold most stable): | +6, +5, +4, +3 |
| Boiling Point (K): | 4407 |
| Melting Point (K): | 1408 |
| Density (at 300K -- g/cm3): | 18.95 |
| Atomic Volume (at 300K -- cm3/mol) | 12.50 |
| Number of natural radioactive isotopes: | 3 |
| Mass Number (Bold naturally occurring) -- Half-Life -- Disintigration Type: |
233 -- 1.59 x 105 years -- alpha particle emission 234 -- 2.44 x 105 years -- alpha particle emission 235 -- 7.04 x 108 years -- alpha particle emission 236 -- 2.34 x 107 years -- alpha particle emission 237 -- 4.47 x 109 years -- alpha particle emission |
| Covalent Radius (Å): | 1.42 |
| Atomic Radius (Å): | 1.38 |
| First Ionization Potential (V): | 6.05 |
| Electronegativity (Pauling's): | 1.38 |
| Specific Heat Capacity (at 300K -- J g-1 K-1): | 0.12 |
| Heat of Vaporization (kJ/mol): | 522.58 |
| Heat of Fusion (kJ/mol): | 15.48 |
Electrical Conductivity (at 293K for polycrystalline material -- 106  -1 cm-1): |
3.6 |
| Thermal Conductivity (at 300K -- W m-1 K-1): | 27.6 |
| Crystal Structure: |  Orthorhombic |
| Acid-Base Properties: |  Amphoteric |