Symbol
La
Atomic Number
57
Atomic Mass
138.904
Protons
57
Neutrons
82
Electrons
57
Type
Lanthanide
Isotopes
Lanthanum-138
Discovery Year
1839
Discovered By
Karl Gustav Mosander
Group
3
Period
6
Boiling Point
3464°C
Melting Point
920°C
Electron Configuration
[Xe] 6s² 5d¹
Density (g/cm³)
6.145
Crystal Structure
Hexagonal
Magnetism
Paramagnetic
Abundance in Earth's Crust
0.0006%
Phase at Room Temperature
Solid