Lanthanum was discovered by a Swedish chemist, Carl Gustaf Mosander in the mineral cerite, in 1839.
Name: Lanthanum Symbol: La Atomic number: 57 Atomic weight: 138.91 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron configuration: 5d1 6s2
Density: 6.162 g/cm-3 Melting point: 1193 K,920 °C,1688 °F Boiling point: 3737 K,3464 °C,6267 °F
Oxidation states: 3, 2 Electronegativity: 1.10 (Pauling scale) Ionization energies: 1st: 538.1 kJ·mol-1 Covalent radius: 207±8 pm Van der Waals radius: no data
There are two naturally occurring isotopes of lanthanum exist, 138La, and 139La.