Question

Question #30180

Answer 1

X = -3
Y = +6

Explanation:

This is basically a math problem. Given `XH_3` we know the valence of X must be -3 if H = +1. Then `YX_2` means that the valence of `Y = -2*X` ; `Y = 6`.
If the hydrogen ion is actually -1 instead of +1, these signs would be reversed.