Ele037 - Rubidium - (Elements Series) Traditional Cache

Rubidium is a chemical element with the symbol Rb and it has an atomic number of 37.  The atomic mass of Rubidium is 85.4678. 

Things you might not know about Rubidium:

1. Rubidium has also been reported to ignite spontaneously in air.
2. Rubidium compounds are sometimes used in fireworks to give them a purple color.
3. Rubidium reacts violently with water and can cause fires.

See GC2XAY2 - Hydrogen, for an explanation about this series of caches.