| Symbol |
La |
|
| Atomic Number |
57 |
Relative Atomic Mass
12C = 12.0000 |
138.9055 |
Atomic Radius
pm |
188 |
First Ionisation Energy
kJ mol-1 |
538.1 |
| Electronegativity |
1.10 |
Density
kg m-3 |
6145 [298 K] |
Molar Volume
cm3 |
22.60 |
Thermal Conductivity
W m-1 K-1 |
13.5 [300 K] |
Melting Point
K |
1194 |
Boiling Point
K |
3730 |
| Number of Isotopes |
26 |
Ground State Electron
Configuration |
[Xe]5d16s2 |
| Term Symbol |
2D3/2 |
| Discovery |
Discovered by C.G. Mosander (Stockholm, Sweden) in 1839 |
| Name Derived From |
Greek lanthanein meaning 'to lie hidden' |
Name in Other
Languages |
 Croatian | Lantan |
 Danish | lanthan |
 Dutch | lantaan |
 Finnish | lantaani |
 French | lanthane |
 German | Lanthan |
 Italian | lantanio |
 Norwegian | lantan |
 Portuguese | lantânio |
 Spanish | lantano |
 Swedish | lantan |
| Peter van der Krogt's Element Multidict - element name translations in over 48 langauges |
