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Chemistry Question on Solutions

A solid AB has rock salt structure. If the edge length is 520 pm and radius A+A^+ is 80 pm ; theradius of anion B−B^- would be

A

440 pm

B

220 pm

C

360 pm

D

180 pm

Answer

180 pm

Explanation

Solution

Edge length in rock salt structure = 2[r(A+)+r(B−)]2[r(A^+) + r(B^-)] r(B−)=520−1602r(B^-) = \frac{520 - 160}{2} = 180 pm.