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Chlorine ( ; from ) is a chemical element with symbol Cl and atomic number 17.
Chlorine is in the halogen group ( 17 ) and is the second lightest halogen after fluorine.
The element forms diatomic molecules under standard conditions, called dichlorine.
It has the highest electron affinity and the third highest electronegativity of all the elements ; for this reason, chlorine is a strong oxidizing agent.
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