Ele017 - Chlorine - (Elements Series) Traditional Cache

Chlorine is the chemical element with an atomic number of 17 and the symbol CL on the periodic table.  It has an atomic weight of 35.453. 

Things you might not know about Chlorine:

1. More than a few breaths of Chlorine in concentrations of 1000ppm will typically kill you.
2. In 1826, silver chloride was used to produce photographic images for the first time.
3. Polyvinyl chloride (PVC) was invented in 1912, initially without a purpose.
4. Chlorine gas, also known as bertholite, was first used as a weapon in World War I by Germany on April 22, 1915 in the Second Battle of Ypres.

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