Why are halogens having 7 electrons in their outermost shell
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Chlorine and Fluorine are the only halogens which have 7 electrons in there outermost shell!
They can obtain stability by gaininga electron and fulfulling there octet.
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Explanation:
because the elements which are having 7 valency are group ed in halogens
they are readily react with 1 st group elements
and the elements in the 17 th group are designed in the way of 2,8,7
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