Answer: A. \(\text{X}_2\text{Y}\) is ionic with two X ions to one Y ion. For neutrality, two \(\text{X}^{+}\) balance one \(\text{Y}^{2-}\), so each X atom gives away one electron to become \(\text{X}^{+}\) and each Y atom gains two electrons to become \(\text{Y}^{2-}\).
So each atom of X gives away one electron only.
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