Question

$AB$ crystallizes in a body centred cubic lattice with edge length ${}^{\prime }{a}^{\prime }$ equal to $387pm$. The distance between two oppositely charged ions in the lattice is:

• A. $335pm$
• B. $250pm$
• C. $200pm$
• D. $300pm$

Answer 1

The correct option is A $335pm$

Distance between two oppositely charge ions for BCC

$(r^{+}+r^{-})=\frac{a\sqrt{3}}{2}=\frac{387\times \sqrt{3}}{2}$
$=335.15pm$