Question

A solid $X^{+} Y^{-}$ has a bee structure. If the distance of closest approach between the two atoms is 173 pm, the edge length of the cell is

• A. 200 pm
• B. $\sqrt{3} / \sqrt{2} pm$
• C. 142.2 pm
• D. $\sqrt{2} pm$

Answer 1

Answer: (A)

200 pm

Answer 2

Nearest neighbour distance $(d)=1.73 ?$ For $b c c, d=\frac{\sqrt{3}}{2} a(a=$ edge length $)$ $a=\frac{1.73 \times 2}{\sqrt{3}}=2 ? \text { or } 200 \,pm$