An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound. (3)(a) Write the position of these elements in the modern periodic table.(b) Write the formula of the compound formed.Justify your answer in each case.
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X is Cl
Y is Ca
Compound is CaCl2- calcium chloride
Cl (chlorine) is in 3rd period 17th group
Ca (calcium) is in 4th period 2nd group
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