A binary solid (AB) has a rock salt structure. If the edge length is 400 pm, and radius of cation is 80 pm the radius of anion is:

A binary solid (AB) has a rock salt structure. If the edge length is 400 pm, and radius of cation is 80 pm the radius of anion is:

A
100 pm
B
120 pm
C
250 pm
D
325 pm

Solution:

$\begin{array}{l} a = 2 (r^{+} + r^{â}) â 400 = 2 (80 + r_{a}) \\ â´ r_{a} = 120 \end{array}$

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