la

Science Dictionary
La  
The symbol for lanthanum.
American Heritage
Science Dictionary
lanthanum   (lān'thə-nəm)  Pronunciation Key 
Symbol La
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.
The American Heritage® Science Dictionary
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