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CHLO-RINE 
Chlorine always reminds us of laying out by the pool on a summer day. There's that harsh little smell that always came from the room with the pool filters. It wasn't always that way. It wasn't until 1774 that a chemist named Davy isolated chlorine gas. It's not clear like other gases; it actually has a greenish tint to it. Once he purified the element, science was able to prove that chlorine existed in thousands of compounds that we use every day. It makes all of those compounds because it is super reactive. Chlorine is the second member of the halogen family. It's is right there in the periodic table with other elements like bromine and iodine. Being a halogen, chlorine is found in many salts that are formed with both alkali metals and alkali earth metals (groups I and II). Always think about table salt that combines sodium with chlorine (NaCl). Scientists use the letter "Cl" to represent chlorine in chemical equations.
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