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Radius ratio
Concepts tested here
- Octahedral void
All Questions
2011 AIPMT-MAINS 1 question
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A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion ($Y^-$) will beIn the NaCl structure the cations occupy octahedral voids of the close-packed anion lattice.
For a cation that just fits an octahedral void, the limiting radius ratio is $\frac{r_+}{r_-} = 0.414$
$r_- = \frac{r_+}{0.414} = \frac{100}{0.414}$
$r_- = 241.5$ pm