Symbol	La	Atomic radius: pm	187	Fusion: kJ/Mole	6.20
Name	Lanthanum	Ionic radius: pm	(+3)116	Boiling point: °C	3464
Atomic number	57	Electron affinity	0.5	Melting point: °C	918
Atomic weight	138.9	1st  ion potential	5.77	Specific Heat Cap: J/(g K)	0.20
Classification	Trans metal	Natural form	Solid	Thermal Cond: W/(cm K)	0.13
Configuration	[Xe]5d16s2	Crystal structure	Hex	Electrical Cond	0.0126
Oxidation states	3	Density	6.15	Abundance: mg/kg-crust	39
Electronegativity	1.10	Vaporization: kJ/Mole	399.6
Lanthanum was discovered in 1839 by Carl Gustaf Mosander.			Uses - lighter flints, studio lighting and projection, special optical glasses such as camera lenses