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Lanthanum,  57La
General properties
Name, seembol lanthanum, La
Appearance sillery white
Pronunciation ˈɫanθənəm
Lanthanum in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Airn (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Capper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Siller (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercur (transeetion metal)
Thallium (post-transeetion metal)
Leid (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)


Atomic nummer (Z) 57
Group, block group n/a, f-block
Period period 6
Element category   lanthanide, whiles conseedered a transeetion metal
Staundart atomic wicht (Ar) 138.90547
Electron configuration [Xe] 5d1 6s2
per shell
2, 8, 18, 18, 9, 2
Pheesical properties
Phase solid
Meltin pynt 1193 K ​(920 °C, ​1688 °F)
Bylin pynt 3737 K ​(3464 °C, ​6267 °F)
Density near r.t. 6.162 g/cm3
when liquid, at m.p. 5.94 g/cm3
Heat o fusion 6.20 kJ/mol
Heat o vapourisation 402.1 kJ/mol
Molar heat capacity 27.11 J/(mol·K)
vapour pressur (extrapolated)
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2005 2208 2458 2772 3178 3726
Atomic properties
Oxidation states 3, 2 (strangly basic oxide)
Electronegativity Pauling scale: 1.10
Atomic radius empirical: 187 pm
Covalent radius 207±8 pm
Creestal structur hexagonal
Hexagonal crystal structur for lanthanum
Speed o soond thin rod 2475 m/s (at 20 °C)
Thermal expansion (r.t.) (α, poly) 12.1 µm/(m·K)
Thermal conductivity 13.4 W/(m·K)
Electrical resistivity (r.t.) (α, poly) 615 n Ω·m
Magnetic orderin paramagnetic[1]
Young's modulus (α form) 36.6 GPa
Shear modulus (α form) 14.3 GPa
Bouk modulus (α form) 27.9 GPa
Poisson ratio (α form) 0.280
Mohs haurdness 2.5
Vickers haurdness 491 MPa
Brinell haurdness 363 MPa
CAS Nummer 7439-91-0
Diskivery Carl Gustaf Mosander (1838)
Maist stable isotopes o lanthanum
iso NA hauf-life DM DE (MeV) DP
137La syn 6×104 y ε 0.600 137Ba
138La 0.090% 1.05×1011 y ε 1.737 138Ba
β 1.044 138Ce
139La 99.910% - (SF) <38.944
Decay modes in parentheses are predicted, but hisna yet been observed
· references

Lanthanum is a chemical element wi the seembol La an atomic nummer 57. Lanthanum is a siller white metallic element an is the first element o the lanthanide series. It is foond in some rare-yird minerals, uisually in combination wi cerium an ither rare yird elements. Lanthanum is a malleable, ductile, an saft metal that oxidises rapidly whan exposed tae air. It is produced frae the minerals monazite an bastnäsite uisin a complex multistage extraction process. Lanthanum compoonds hae hantle applications as catalysts, additives in gless, carbon lichtin for studio lichtin an projection, igneetion elements in lichters an torches, electron cathodes, scintillators, an ithers. Lanthanum carbonate (La2(CO3)3) haes been approved as a medicine for treatin renal failur.

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