Correct Answer: Option D

Explanation

Element P with 6 electrons has an atomic number of 6 =  2, 4 → C
Element Q with 11 electrons has an atomic number of 11 = 2, 8, 1 → Na
Element R with 15 electrons has an atomic number of 15 = 2, 8, 5 → P
Element S with 17 electrons has an atomic number of 17 = 2, 8, 7 → Cl

Given the above is the electronic arrangement of P,Q,R,S elements, Q will form an electrovalent bond with S because element Q(metal) has a valence of electron of 1 it can donate to another element needing 1 electron, which is element S (a non-metal). Thus, electrovalent bond is formed in compounds where there is a transfer of electron from metals to non-metals.

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