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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.


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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