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One Line Answer
Based on the group valency of element write the molecular formula of the following compound giving justification:
Compound formed when an element A of group 2 combines with an element B of group seventeen.
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Solution
The general formula for those kinds of compounds would be AB2
Example- MgCl2, CaCl2. This is because the valency of group 2 elements is 2 and that of group 17th elements if 1 so to satisfy the combining capacity of group 2 elements two of group 17 elements are required in the molecular formula. 
Concept: Periodic Properties
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