Answer:
The answer to your question is XY₂
Explanation:
Process
1.- If an element has two electrons in its outermost shell it means that it has a valence of 2.
This element is represented by X⁺²
2.- If an element has seven electrons in its outermost shell it means that its oxidation number is -1.
This element is represented by Y⁻¹
3.- Now, join the elements
X⁺² + Y⁻¹ ⇒ XY₂
