Solid StateHard

Question

Which of the following expressions is correct in the case of a sodium chloride unit cell (edge length = a)

Options

A.r_c + r_a = a/2

B.r_c + r_a = a

C.r_c + r_a = 2a

D.r_c + r_a = 2^1/2 a

Solution

∴ 2 ( r₊ + r_-) = a

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