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Which of the expressions is correct in t...

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

A

`r_(c) + r_(a) = alpha/2)`

B

`r_(c) + r_(a) =a)`

C

`r_(c) + r_(a) = 2a`

D

`r_(c)+r_(a)=2^(1/2)a`

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