who belongs to 17th group and 3rd period of periodic table
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Chlorine
Counting the periods and matching it with the periods of that of halogens, we find that period 3 has Chlorine. So, the element is Chlorine. Element X has 17 electrons i.e. 7 electrons in its valence shell, so it will accept 1 electron, hence, its valency is 1.
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