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Lanthanum is a lanthanide which is found in, cerite, monazite, allanite, and bastinite.

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Without lanthanum people that need glasses wouldn't have glasses because lanthanum is in the lenses, also pictures wouldn't zoom. Movies/plays would not have lights and you couldn't watch them in a theater because there would be no projectors.

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Lanthanum is the first of the rare earth minerals. Hear a mnemonics used by chemists to remember the order of the lanthanide series.

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Lanthanum was discovered in January 1839 by Carl Gustav Mosander at the Karolinska Institute, Stockholm. He extracted it from cerium which had been discovered in 1803. Mosander noticed that while most of his sample of cerium oxide was insoluble, some was soluble and he deduced that this was the oxide of a new element.

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Some uses are carbon arc lights, studio lights, projector lights, camera lights, and other glass lenses.

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Melting point 920°C, 1688°F, 1193K

Boiling point 3464°C, 6267°F, 3737K

Density (g cm−3) 6.15

Atomic number 57

Relative atomic mass 138.905

State at 20°C Solid

Key isotopes La, Period 6,  Block d

Electron configuration [Xe] 5d16s2 CAS number 7439-91-0

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The name lanthanum is derived from the Greek 'lanthanein', meaning to lie hidden.

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Lanthanum is a soft, ductile, silvery-white rare-earth metal element with symbol La and atomic number 57. In the periodic table, it is the first element of the lanthanide series (or, less frequently, the first element of the 6th-period transition metals). It is usually found in combination with cerium and other rare earth elements.