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Q.
$r_{N a^{+}}=195 \, pm$ and $r_{C l^{-}}=281 \, pm$ in $NaCl$ (rock salt) structure. What is the shortest distance between $Na^{+}$ ions?
NTA AbhyasNTA Abhyas 2020The Solid State
Solution:
The shortest distance between two $Na ^{+}$ion $=\frac{1}{2}$ face - diagonal
$=\frac{1}{2} \times \sqrt{2} \,\,\,2 r _{ Na }++ r _{ Cr } $
$=\sqrt{2}(195+281) pm =673.06\, pm$