Q. 434.6( 9 Votes )

An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.

(a) Where in the periodic table are elements X and Y placed?

(b) Classify X and Y as metal (s), non-metal (s) or metalloid (s).

(c) What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed.

(d) Draw the electron dot structure of the divalent halide.

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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