| Atomic Number: | 57 |
| Element Symbol: | La |
| Element Name: | Lanthanum |
| Atomic Weight: | 138.9055 |
| Group Name: | Lanthanoid |
| Period Number: | 6 (lanthanoid) |
| Block: | f-block |
| Ground State Configuration: | [Xe] 5d 6s2 |
| Ground State Level: | 2D3/2 |
| Standard State: | Solid |
| Bond Length: | 373.9 |
| Atomic Radius Empirical: | 195 |
| Covalent Radius Empirical: | 169 |
| Electron Affinity: | 48 |
| First Ionization Energy: | 538.1 |
| Pauling Electronegativity: | 1.10 |
| Allred Rochow Electronegativity: | 1.08 |
| Density Of Solid: | 6146 |
| Molar Volume: | 22.39 |
| Velocity Of Sound: | 2475 |
| Youngs Modulus: | 37 |
| Rigidity Modulus: | 14 |
| Bulk Modulus: | 28 |
| Poissons Ratio: | 0.28 |
| Mineral Hardness: | 2.5 |
| Brinell Hardness: | 363 |
| Vickers Hardness: | 491 |
| Electrical Resistivity: | 61 |
| Melting Point: | 920 |
| Boiling Point: | 3470 |
| Superconduction Temperature: | -267 |
| Thermal Conductivity: | 13 |
| Coefficient Of Linear Expansion: | 12.1 |
| Enthalpy Of Fusion: | 6.2 |
| Enthalpy Of Vaporization: | 400 |
| Enthalpy Of Atmization: | 431 |
| Most Common Oxidation Numbers: | 3 |
| Color: | Silvery white |
| Classification: | Metallic |
| Discovered By: | Carl Gustaf Mosander |
| Discovered At: | Sweden |
| Discovered When: | 1839 |
| Origin Of Name: | From the Greek word lanthanein meaning to lie hidden |
Calculate the molecular weight of Lanthanum or molecular weight La.
Also see the full list of chemical elements and atomic weights.