element.nameElectron Panel Modal created by GPPT Lab57Atom NumberLaSymbolLanthanumNameLanthanideCategory3.0GroupSolidPhaseDiscovered ByCarl Gustaf Mosander1839Year138.906uAtomic Mass27.110kJ/molMolar Heat240.00Atomic Radius3.0Groupg/cm36.162Density6.0Period3737.000°KBoil1193.000°KMelt
Electrons>element.nameElectron shell created by GPPT Lab contact@gppt.tnLa57
Protons and Neutronselement.nameElectron shell created by GPPT Lab contact@gppt.tn57 neutron57 Proton
Lanthanum is a soft, ductile, silvery-white metallic chemical element with symbol La and atomic number 57. It tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. It gave its name to the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table:it is also sometimes considered the first element of the 6th-period transition metals.