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
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
8.5
Evaporation Heat(kj/mol)
402
Thermal Conductivity(@25°C W/m K)
13.4
Debye Temperature
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
