I assume the superscripts should be subscripts (unless you're a student in France).
Next, why are b and c not the same. BaCl2 is an example so either b or c should be correct. USUALLY the metal is written first so c is more correct than b.
Also, I don't understand how the formula demonstrates the bond. I would write the bond
WY2 ==> W^2+ + 2Y^-
A W element that is in the IIA family combines with a Y element in the VIIA family and results in an ionic compound whose only likely formula is: (demonstrate the bond)
a)WY
b)Y²W
c)WY²
d)W²Y
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