Lanthanum is a chemical element with
the symbol La and it has an atomic number of 57. The atomic
weight is 138.90547. 
Things you might not know about
Lanthanum:
- Although lanthanum belongs to the element
group called rare earth metals, it is not rare at all.
- A typical hybrid automobile battery for a
Toyota Prius requires 10 to 15 kg (22-33 lb) of
lanthanum.
- The first historical application of lanthanum
was in gas lantern mantles. The original mantles gave off a
green-tinted light.
See GC2XAY2 - Hydrogen, for an explanation
about this series of caches.
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