Properties | |
| Atomic Number: | 75 |
| Atomic Weight: | 186.207 |
| Electron Configuration (at ground state): | 1s22s22p63s23p63d104s24p64d104f145s25p65d56s2 |
| Oxidation States (Bold most stable): | +7, +6, +4, +2, -1 |
| Boiling Point (K): | 5870 |
| Melting Point (K): | 3455 |
| Density (at 300K -- g/cm3): | 21.0 |
| Atomic Volume (at 300K -- cm3/mol) | 8.85 |
| Number of stable isotopes: | 1 |
| Number of natural radioactive isotopes: | 1 |
| Mass Number (Bold naturally occurring) -- Half-Life -- Disintigration Type: |
187 -- 5 x 1010 years --
beta particle (electron) emission |
| Covalent Radius (Å): | 1.28 |
| Atomic Radius (Å): | 1.37 |
| First Ionization Potential (V): | 7.88 |
| Electronegativity (Pauling's): | 1.9 |
| Specific Heat Capacity (at 300K -- J g-1 K-1): | 0.137 |
| Heat of Vaporization (kJ/mol): | 707.1 |
| Heat of Fusion (kJ/mol): | 33.05 |
Electrical Conductivity (at 293K for polycrystalline material -- 106  -1 cm-1): |
5.8 |
| Thermal Conductivity (at 300K -- W m-1 K-1): | 47.9 |
| Crystal Structure: |  Hexagonal |
| Acid-Base Properties: |  Slightly acidic |