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If x = radius of Na^(+) " & " y = radiu...

If x = radius of `Na^(+) " & " y =` radius of `Cl^(-)` & a is the unit cell edge length for NaCl crystal, then which of the given relation is correct ?

A

`x + y = a`

B

`2x + 2y = a`

C

`x + y = 2a`

D

`x + y = sqrt2a`

Text Solution

Verified by Experts

The correct Answer is:
B
`{:(2(r^(+) + r^(-)) = a,"or",r^(+) = x = " radius of " Na^(+)),(2(x + y) = a,,r^(-) = y = " radius of " Cl^(-)):}`
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