Chlorine Facts

Chlorine Facts
Chlorine (Cl) is a member of the halogen group with an atomic number of seventeen. One of its forms, NaCl, has been in use since ancient times.
Interesting Chlorine Facts:
Chlorine has been in use for thousands of years in other forms, but it wasn't named until 1810 by Sir Humphry Davy.
Only fluorine is a lighter halogen than chlorine.
It is the second most common halogen on Earth.
The element itself is the 21st most common element, at about 170 parts per million.
It took almost 200 years from the discovery of chlorine gas for it to become recognized as an element.
Sodium chloride is the most common compound of chlorine, and it is abundant on Earth, especially in seawater.
Chlorine in its pure form is yellowish-green, but its common compounds are typically colorless.
Chlorine is capable of joining with practically every element, producing a chloride.
In many of these chloride forms, chlorine is vital for living organisms.
Highly concentrated pure chlorine is dangerous to living beings, though.
It is also creates a wide variety of oxides.
Chlorine is a widely used oxidizing agent, and is also potentially a reactive agent.
Chlorine has two stable isotopes, Cl-35 and Cl-37.
Its isotope Cl-36 is radioactive, and was first found produced in seawater surrounding nuclear test fires in the atmosphere.
Chlorine's Cl-36 is also used for dating ice samples and some rock samples.
Evidence shows that civilizations were intentionally using mined rock salt and oceanic salt over 5000 and 8000 years ago, respectively.
The chloralkai process has been used since 1892 to produce commercial elemental chlorine from NaCl and water.
Chlorine is used industrially and commercially to fight infection and bacteria, and for bleaching or whitening of textiles.

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