Answer :

(a) Element X belongs to Group 17 and 3rd period. X is Cl (chloride).

Element Y belongs to Group 2 and 4th period. Y is Ca (calcium).

(b) X is a non-metal and Y is a metal.

(c) Metals always combine with oxygen to form basic oxides. Basic oxides react with acids to form salt and water.

In a reaction, meals lose electrons and non-metals gain electrons. Thus positive and negative ions are formed. This creates a strong electrostatic force between these ions. These strong electrostatic forces form the ionic bonds.

(d) Electron dot structure

Electron dot structure for calcium chloride

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