Chlorine Cl

Chlorine is the raw material for a huge number of chemical products in everyday life. Four million tons are produced annually in Germany alone. However, some chlorine compounds are both a blessing and a curse. Hermann Pütter looks at the various facets of this element. To the article about chlorine on the website FaszinationChemie.

In the Chlorine video from Periodic Videos, Martyn Poliakoff and his team describe the properties of chlorine and its inglorious role as a war gas in World War I. But they also show what happens when you mix hot iron with chlorine. (It's a mess, but we don't have to clean the trigger.)


The halogens form the 17th group of the periodic table. They include fluorine, chlorine, bromine, iodine and the radioactive astatine.

A few years ago, Tennes, which does not occur naturally, was added as an element with the number 117. Tennes was first artificially created a few years ago at the Dubna nuclear research center near Moscow. Its name refers to the US state of Tennessee, which is home to another research center, the Oak Ridge National Laboratory, where various heavy elements were artificially produced.

back to the periodic table

back to the start page for the year of the periodic table

to our brochure Chemistry of the Elements

published June 2019 with articles on 43 elements (7 MB, 160 pages)

Photo credits: W. Oelen, Chlorine ampoule, CC BY-SA 3.0

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last modified: 10.05.2021 16:29 H from N/A