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Chemical Elements

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Chlorine is a chemical element with symbol Cl and atomic number 17. Chlorine is in the halogen group and is the second lightest halogen after fluorine. The element is a yellow-green gas under standard conditions, where it forms diatomic molecules.


Symbol: ClElectron configuration: Ne 3s2 3p5Atomic number: 17Discovered: 1774

The most common compound of chlorine, sodium chloride, has been known since ancient times. Around 1630 chlorine gas was first synthesized in a chemical reaction, but not recognized as a fundamentally important substance.

Physical characteristics of chlorine and its compoundsAt standard temperature and pressure, two chlorine atoms form the diatomic molecule Cl2. This is a yellow-green gas that has a distinctive strong odor, familiar to most from common household bleach.

Chemical characteristicsAlong with fluorine, bromine, iodine, and astatine, chlorine is a member of the halogen series that forms the group 7 of the periodic table. Chlorine forms compounds with almost all of the elements to give compounds that are usually called chlorides. Chlorine gas reacts with most organic compounds, and will even sluggishly support the combustion of hydrocarbons.

Chemistry and compuondsChlorine exists in all odd numbered oxidation states from −1 to +7, as well as the elemental state of zero and four in chlorine dioxide (see table below, and also structures in chlorite). Progressing through the states, hydrochloric acid can be oxidized using manganese dioxide, or hydrogen chloride gas oxidized catalytically by air to form elemental chlorine gas.

ChloridesChlorine combines with almost all elements to give chlorides. Compounds with oxygen, nitrogen, xenon, and krypton are known, but do not form by direct reaction of the elements. Chloride is one of the most common anions in nature. Hydrogen chloride and its aqueous solution, hydrochloric acid, are produced on megaton scale annually both as valued intermediates but sometimes as undesirable pollutants.

Done by: Jewel Koh (14)- leader Janelle Teoh (12) Miya Yong (18) Rayshall Yeoh (22) Tay Aik Fen (25)

Credits: Google and Wikipedia

It is used for disinfecting drinking water, in the production of textiles, paper products, dyes, petroleum products, medicines, insecticides, disinfectants, foods, solvents, plastics, paints, and many other products. The element is used to manufacture chlorates, carbon tetrachloride, chloroform, and in the extraction of bromine. Chlorine has been used as a chemical warfare agent.

Uses of Chlorine


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