Correct Answer: Option C

Explanation

- When an element in group 1 takes part in a reaction, its atoms lose their outer electron and form positively charged ions , called cations .

- Group 6 elements, have 6 valence electrons and will tend to take 2 electrons and have a valency of -2.

- Hence; one atom of element X will require two atoms of Y 

- To form a compound XY\(_2\) or Y\(_2\)X

For example, you can consider Oxygen as atom X(with electronic configuration of 2,6) and Sodium as atom Y(with electronic configuration of 2,8,1). When they combine, two atoms of Na will combine with one atom of O, giving rise to Na\(_2\)O → Y\(_2\)X 

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