How can Al^3+ and S^2- be packed in a unit cell to make a neutral compound?...
How can Al^3+ and S^2- be packed in a unit cell to make a neutral compound? The answer is 'Al on the corners and in center, S on edges', but I don't understand why.
Homework Answers
To make a neutral compund charge on cation and anion should be same.
Atom at corner contribution = 1/8
Atom at center = 1
Atom at edge centre = 1/4
So total aluminum atom = corner +. Center = 8*1/8 + 1 = 2 atom
Total charge on Al = +3*2 = +6
Total Sulfur atom = edge centre = 12 *1/4 = 3
Total charge on S - atom = -2 *3 = +6
So neutral compund is formed in unit cell.
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How can Al^3+ and S^2- be packed in a unit cell to make a
neutral compound?...
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