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lanthanum
[ lan-thuh-nuhm ]
noun
- a rare-earth, trivalent, metallic element, allied to aluminum, found in certain minerals, as monazite. : La; : 138.91; : 57; : 6.15 at 20°C.
lanthanum
/ ˈlænθənəm /
noun
- a silvery-white ductile metallic element of the lanthanide series, occurring principally in bastnaesite and monazite: used in pyrophoric alloys, electronic devices, and in glass manufacture. Symbol: La; atomic no: 57; atomic wt: 138.9055; valency: 3; relative density: 6.145; melting pt: 918°C; boiling pt: 3464°C
lanthanum
/ lăn′thə-nəm /
- A soft, malleable, silvery-white metallic element of the lanthanide series. It is used to make glass for lenses and lights for movie and television studios. Atomic number 57; atomic weight 138.91; melting point 920°C; boiling point 3,469°C; specific gravity 5.98 to 6.186; valence 3.
- See Periodic Table
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Word History and Origins
Origin of lanthanum1
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Word History and Origins
Origin of lanthanum1
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Example Sentences
Not to mention rare elements such as lanthanum, cerium, and neodymium, essential to modern technology and commanding high prices.
Lanthanum sulphide, La2S3, is a yellow powder, obtained when the oxide is heated in the vapour of carbon bisulphide.
Lanthanum hydroxide, La(OH)3, is a white amorphous powder formed by precipitating lanthanum salts by potassium hydroxide.
Lanthanum, lan′tha-num, n. a metal discovered in 1839 in cerite, a hydrated silicate of cerium.
During an absence of several days, the inventor left a mantle of lanthanum oxide locked up in his laboratory.
Didymium, a rare metallic element, occurring along with lanthanum in the mineral cerite as discovered by Mosander in 1842.
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