Relative atomic mass: 35.453 +- 0.002

English: Chlorine
French: Chlore
Croatian: Klor
German: Chlor
Italian: Cloro
Spanish: Cloro

Atomic number: 17
Group numbers: 17
Period: 3
Standard state (20 oC): gas

Discovery: 1774 Carl William Scheele (SE)
Chlorine was discovered by Carl William Scheele (SE) in 1774. The origin of the name comes from the Greek word chloros meaning pale green. It is a greenish-yellow, disagreeable gas with irritating odour. The gas is toxic and severe irritant by contact or inhalation. It's Never found in free form in nature. Commercial quantities of chlorine are produced by electrolysis of aqueous sodium chloride (NaCl) from seawater or brine from salt mines. Sulfur is used in water purification, bleaches, acids and many, many other compounds such as chlorofluorocarbons (CFC).
Electronic configuration: [Ne] 3s2 3p5
Formal oxidation number: -1 +1 +5 +7
Atomic radius: 99.4 pm

Electronegativities: 3.16
Thermal conductivity: 0.0089 W/(m K)
Electrical resistivity (20 oC): - microOhm cm

Melting point: -101.5 oC
Boiling point: -34.04 oC

Heat of fusion: 6.41 kJ/mol
Heat of vaporization: 20.4033 kJ/mol
Heat of atomization: 120 kJ/mol

16S <= 17Cl => 18Ar

ASCII Periodic Table of the Elements
6 Jan. 2020
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