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{{Element | name=Lanthanum | symbol=La | anumber=57 | amass=138.9055 amu | state=Solid | class=Rare Earth Metals | cstructure=Hexagonal | density=6.145 g/cm^3 | color=Silvery-white | stableisotopes=2 | date=1839 | discname=Carl Mosander | origname=From the Greek ''lanthanein'', meaning ''to lie hidden''. | uses=Due to the refractive properties it adds to glass, it is used in expensive camera lenses. Also used in lighter flints, battery electrodes, catalytic converters, and as a biological tracer. | obtained=Found along with [[monazite]] and [[bastnasite]]. }}

{{Element | name=Lanthanum | symbol=La | anumber=57 | amass=138.9055 amu | state=Solid | class=Rare Earth Metals | cstructure=Hexagonal | density=6.145 g/cm^3 | color=Silvery-white | stableisotopes=2 | date=1839 | discname=Carl Mosander | origname=From the Greek ''lanthanein'', meaning ''to lie hidden''. | uses=Due to the refractive properties it adds to glass, it is used in expensive camera lenses. Also used in lighter flints, battery electrodes, catalytic converters, and as a biological tracer. | obtained=Found along with [[monazite]] and [[bastnasite]]. }}

'''Lanthanum''' is an [[element]] in the "rare earths" class of the [[periodic table of the elements|periodic table]].  Specifically, it is the first in the "Lanthanide" series.  It is easily oxidized in air, and reacts with water.  It has two stable isotopes (actually one, but another one has a [[half-life]] of 10¹¹ years).

'''Lanthanum''' is an [[element]] in the [[Rare earth elements|rare earths]] class of the [[periodic table of the elements|periodic table]].  Specifically, it is the first in the "Lanthanide" series.  It is easily oxidized in air, and reacts with water.  It has two stable isotopes (actually one, but another one has a [[half-life]] of 10¹¹ years).

Lanthanum was discovered while searching for impurities in [[Cerium]].

Lanthanum was discovered while searching for impurities in [[Cerium]].