Lanthanum
Symbol
La
Atomic Number
57
Atomic Weight
138.9055
Element Classification
Discovered By
Carl Mosander
Discovery Date
1839 (Sweden)
Name Origin
Greek: lanthanein (to be hidden).
Density (g/cc)
6.15
Melting Point (K)
1194
Boiling Point (K)
3730
Appearance
Silvery-white, soft, malleable, and ductile metal
Atomic Radius (pm)
187
Atomic Volume (cc/mol)
22.5
Covalent Radius (pm)
169
Ionic Radius
101.6 (+3e)
Specific Heat
0.197
Fusion Heat (kJ/mol)
8.5
Evaporation Heat (kJ/mol)
402
Thermal Conductivity (@25°C W/m K)
13.4
Debye Temperature (K)
132.00
Pauling Negativity Number
1.10
First Ionizing Energy (kJ/mol)
541.1
Oxidation States
3
Electronic Configuration
[Xe] 5d1 6s2
Lattice Structure
Hexagonal(HEX)
Lattice Constant
3.750
Lattice C/A Ratio
1.619
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