Properties | |
| Atomic Number: | 57 |
| Atomic Weight: | 138.9055 |
| Electron Configuration (at ground state): | 1s22s22p63s23p63d104s24p64d105s25p65d16s2 |
| Oxidation States (Bold most stable): | +3 |
| Boiling Point (K): | 3737 |
| Melting Point (K): | 1191 |
| Density (at 300K -- g/cm3): | 6.15 |
| Atomic Volume (at 300K -- cm3/mol) | 22.5 |
| Number of stable isotopes: | 1 |
| Number of natural radioactive isotopes: | 1 |
| Mass Number (Bold naturally occurring) -- Half-Life -- Disintigration Type: |
137 -- 6 x 104 years -- orbital electron capture 140 -- 40.3 hours -- beta particle (electron) emission |
| Covalent Radius (Å): | 1.25 |
| Atomic Radius (Å): | 1.38 |
| First Ionization Potential (V): | 5.58 |
| Electronegativity (Pauling's): | 1.10 |
| Specific Heat Capacity (at 300K -- J g-1 K-1): | 0.19 |
| Heat of Vaporization (kJ/mol): | 399.57 |
| Heat of Fusion (kJ/mol): | 11.3 |
Electrical Conductivity (at 293K for polycrystalline material -- 106  -1 cm-1): |
1.9 |
| Thermal Conductivity (at 300K -- W m-1 K-1): | 13.5 |
| Crystal Structure: |  Hexagonal |
| Acid-Base Properties: |  Very basic |