Solid StateHard

Question

Edge length of M+X- (fcc structure) is 7.2 A0. Assuming M+ - X- contact along the cell edge, radius of X- ion is(rM+ = 1.6 A0):

Options

A.2.0 A0
B.5.6 A0
C.2.8 A0
D.38 A0

Solution

rM+   +    rx- =
So   rx- = - 1.6 = 2.0 A0 

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