an element X belongs to 3rd period and group 17 of the periodic table.state its electronic configuration and valency.justify your answer with reasoning
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17 th group contains halogens.Element in the period and in 17 th group is chlorine.Its atomic number is 17.
2,8,7 is its E.C
valency is one
2,8,7 is its E.C
valency is one
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