lanthanum definition

  • noun:
    • A soft, silvery-white, malleable, ductile, metallic rare-earth element, gotten mainly from monazite and bastnaesite and used in glass manufacture in accordance with various other unusual earths in carbon lights for movie and television studio lighting effects. Atomic number 57; atomic fat 138.91; melting point 920°C; boiling point 3,469°C; specific gravity 5.98 to 6.186; valence 3. See dining table at factor.
    • A metallic substance element (symbolization La) with an atomic quantity of 57.
    • an uncommon section of the rare-earth band of the metals, of atomic number 57, allied to aluminum. It does occur in certain unusual nutrients, as cerite, gadolinite, orthite, etc., and had been so named from trouble of splitting it from cerium, didymium, as well as other rare-earth elements with which most commonly it is associated. Atomic weight 138.9. Representation La.
    • Chemical image, Los Angeles; atomic weight, 138. A rare material found by Mosander in 1839–41, of didymium in oxid of cerium, and so named from its properties having been formerly concealed by those of cerium.
    • a white soft metallic factor that tarnishes easily; does occur in rare-earth nutrients and is frequently categorized as a rare earth

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