Salt \( A B \) has a zinc blende structure. The radius of \( A^{2+} \) and \( B^{2-} \) ions are...

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Salt \( A B \) has a zinc blende structure. The radius of \( A^{2+} \) and \( B^{2-} \) ions are \( 0.7 \AA \) and \( 1.8 \AA \) respectively. The edge length of \( A B \) unit cell is:
(a) \( 2.5 \AA \)
(b) \( 5.09 \AA \)
(c) \( 5 \AA \)
(d) \( 5.77 \AA \)
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