An element X from group 2 of the periodic table reacts with an element Y from group 17 to form a compound.(a) What is the nature of the compound formed?

(b) State whether the compound formed will conduct electricity or not.
(c) Give the formula of the compound formed.
(d) What is the valency of element X?
(e) How many electrons are there in the outermost shell of an atom of element Y?


(a) The resulting compound is an ionic compound because the elements of group 2 (metals) combine with those of group 17 (non-metals) by the transfer of electrons, an ionic bond is formed.

(b) Yes, it will conduct electricity as it is an ionic compound.

(c) Element X belongs to group 2 so its valency is 2. Element Y is from group 17 so its valency is 1 (18-17=1). So, one atom of X combines with two atoms of Y to give a compound of the formula XY2.

(d) The valency of the element X is 2 as it belongs to group 2.

(e) Group 17 elements have seven electrons present in their outermost shell in their atoms.
      Group number = valence electron+10
      Valence electron = Group number - 10
                               = 17-10 = 7

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Updated on: 10-Oct-2022

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