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Which of the following expressions is co...

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

A

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

B

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

C

`r_(c)+r_(a)=sqrt2a`

D

None of the above

Text Solution

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The correct Answer is:
B
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