If atom X with six electrons in its outermost shell combines with atom Y with one electron in its outermost shell to form an ionic compound, then?

A. six atoms of X will combine with one of Y
B. two atoms of X will combine with six of Y
C. one atom of X will combine with two of Y  
D. two atoms of X will combine with one of Y
E. one atom of X will combine with six of Y

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Correct Answer: C