Lexic.us

Definition of Lanthanum

1. Noun. A white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth.

Definition of Lanthanum

1. n. A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La.

Definition of Lanthanum

1. Noun. A metallic chemical element (''symbol'' La) with an atomic number of 57. ¹

¹ Source: wiktionary.com

Definition of Lanthanum

1. [n -S]

Medical Definition of Lanthanum

1. Lanthanum salts are used as a negative stain in electron microscopy and as calcium channel blockers. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Lanthanum

Literary usage of Lanthanum

Below you will find example usage of this term as found in modern and/or classical literature:

1. Journal of the American Chemical Society by American Chemical Society (1898)
"lanthanum FROM IRON. The lanthanum chloride used in the analyses gave 50.20 per ... I. 0.2968 gram lanthanum chloride with 0.1465 gram ferric chloride gave ..."

2. The Chemical News and Journal of Industrial Science (1904)
"It may be recalled that lanthanum was one of the elements whose atomic weight ... For these two reasons it is natural to expect lanthanum to form an alum. ..."

3. Hand-book of Chemistry by Leopold Gmelin, Henry Watts (1849)
"lanthanum AND CHLORINE. CHLORIDE OP lanthanum.—1. The hydrochloric acid solution of the oxide evaporated and heated in a current of hydrochloric acid gas ..."

4. Analytical Chemistry by Frederick Pearson Treadwell (1921)
"Its salts are colorless and yield no absorption spectrum, so that lanthanum may be distinguished in this way from didymium and erbium. ..."

5. A Treatise on Chemistry by Henry Enfield Roscoe, John Cannell Cain, Carl Schorlemmer (1913)
"lanthanum Cleve ami Hoeglund,1 on the other hand, it is 89"2. ... lanthanum. La = 139-0. 359 lanthanum salts are best obtained pure by the fractional ..."

6. A Manual of Elementary Chemistry, Theoretical and Practical by George Fownes (1873)
"lanthanum is bivalent, forming only one set of compounds. *ix. ... lanthanum salts are colorless; their solutions yield, with alkalies, n precipitate of ..."

7. Manual of qualitative chemical analysis by C. Remigius Fresenius (1867)
"OXIDE OF lanthanum is usually associated with protoxide of cerium. It is white, and does not change color on ignition (distinction from protoxide of cerium) ..."

8. Select Methods in Chemical Analysis. (Chiefly Inorganic). by William Crookes (1871)
"A current of sulphuretted hydrogen passed into the filtrate removes the lead, after which the lanthanum and didymium may be precipitated together as ..."

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