Periodic Table of the Elements
Periodic Table




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name Chlorine
latin Chlorum
french Chlore
german Chlor
symbol Cl
proton number 17
atomic weight 35.4527
Pauling electronegativity 3.16
electronic configuration [Ne] 3s23p5
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melting point 171.6 K, -101.55°C, -150.79°F
boiling point 239.11 K, -34.04°C, -29.27°F
group 17
period 3
state (by 20°C) gas
oxidation states -1, +1, +3, +5, +7
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Year of discovery Discoverer
1774 Carl Wilhelm Scheele (1742-1786)

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