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Cl - Chlorine - periodic table of the elements

A green, highly reactive gas, chlorine is the most abundant halogen, comprising nearly two percent of the seas. Karl Scheele discovered chlorine in 1774, but believed it to be an oxide of a fictitious element, Murium (which is why hydrochloric acid is also known as muriatic acid.) Murium was never found, but Humphrey Davy recognized it's elemental quality in 1810. Chlorine is highly toxic to humans and is used widely in laundry detergent .

 

Atomic number - 17 Density g/mL 0 .000317
Atomic weight u 35 .453 Melting point K 172 .16
Bonding radius A 0 .99 Boiling point K 239 .1
Atomic radius A 0 .97 Heat of vaporization kJ/mol 10 .2
Ionization Potential V 12 .967 Heat of fusion kJ/mol 3 .203
Electronegativity - 3 .16 Specific heat J/gK 0 .48
The oxide is a strong acid.
Crystal are orthorhombic.

Electron configuration: [Ne] 3s2 3p5

Other elements of the periodic table

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HHe
LiBeBCNOFNe
NaMgAlSiPSClAr
KCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLa * HfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAc ** RfDbSgBhHsMt110111112113
Lanthanides* CePrNdPmSmEuGdTbDyHoErTmYbLu
Actinides ** ThPaUNpPuAmCmBkCfEsFmMdNoLr