What are the similarities in properties of elements in Halogen family?
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Solution
All in this group are characterized by the presence of 7e− in an outer shell, and hence have the ability to gain an e− to form negative ions w/ a completed octet of valence e−.
All these elements share traits of being very reactive and in particular form substitution compounds w/ numerous organic compounds.
Although these elements also have other valences all have a −1 valence in common.