An element X belongs to group 17 and period 3 of the periodic table.
give the formula of the compound formed when it combines with an element Y having valency 3.
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Solution
Element X is Cl which belongs to group 17 and period 3. Group 17 elements have valency of 1.
Element Y has valency 3.
YCl3 or YX3
Since Cl has valency 1.