chlorine has an atomic number of 17 reacts with calcium with an atomic number of 20 to form a co
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Element X (Z = 17) is chlorine while element Y (Z = 20) is calcium. <br> (a) Chlorine ( Cl) is a member of group 17 and period 3. Calcium (C a) is present in group 2 and period 4. <br> (b) Chlorine is a typical non-metal while calcium is a metal. <br> (c) The oxide of calcium is calcium oxide (CaO). It is a basic oxide. <br>
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