Chlorine and its Importance Peter arvanitis - Science 8f leone

Background Information

My element is chlorine. The periodic symbol for chlorine is Cl. Chlorine can be located on the periodic table in group 17, period 3. Chlorine was discovered in 1774 by Carl Willhem Scheele. When Scheele discovered chlorine, he called it a "dephlogisticated marine air", meaning that chlorine releases its toxins and is absorbed by the air. Chlorine was officially accepted as an element in 1810. The name chlorine comes from the Greek word khloros, meaning green.

Structure of Chlorine

Atomic number: 17

Atomic mass: 35.4527

Number of protons: 17

Number of neutrons: 35-17=18

Number of electrons: 17

Stable isotopes:

The stable isotopes are Cl-35 and Cl-37

Natural Sources

Chlorine is found bonded with sodium to create common salt

Major Uses of Chlorine


Chlorine is used to purify drinking water. It is also used to kill germs in pool water and in many house and kitchen cleaning agents.

Additional Information

Scientific Information: Chlorine has a melting point of -101.5’C and a boiling point of -34.04’C.

Fun fact: Free chlorine on earth is extremely rare. Chlorine combines with elements to make chlorine compounds called chlorides.

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