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About the Element Lanthanum - number 57 on the periodic table of elements, is used in optical glass lenses - eyeglasses, telescopes and cameras being the most common. It is also used in movie lighting and lighter flints. Lanthanum is a silvery white metallic element belonging to group 3 of the periodic table and often considered to be one of the lanthanides. Lanthanum is malleable, ductile, and soft enough to be cut with a knife. Lanthanum was discovered in 1839 by Swedish chemist Carl Gustav Mosander, when he partially decomposed a sample of cerium nitrate by heating and treating the resulting salt with dilute nitric acid. From the resulting solution, he isolated a new rare earth he called lantana. Lanthanum was isolated in relatively pure form in 1923. The word lanthanum comes from the Greek lanthaneis = to lie hidden. Obtained From: monazite, bastnasite
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Lanthanum by Jennifer Schmitt see also: Helium |
Symbol: La Atomic number: 57 Atomic weight: 138.905
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