Answer:
Option B) WX2
Explanation:
Data obtained from the question include:
Valency of W = 2
Valency of X = 7
From the data obtained from the question,
W has 2 electrons in it's outermost shell and can easily lose them to form bond.
X has 7 electrons in it's outermost shell and can not lose them to form bond. Instead it will accept electron to form bond.
When W and X combines, the outcome is given below:
1. W loses it's 2 valency to form W ion (W^2+)
W —> W^2+ + 2e-
2. X receives the 2 electrons from W to X ion (X^-) as shown below:
2X + 2e- —> 2X^-
Combining both equations together, we obtained:
W + 2X + 2e- —> W^2+ + 2X^- + 2e-
Eliminate 2e- from both side
W + 2X —> W^2+ + 2X^- —> WX2
Therefore,
W + 2X + —> WX2
