Q. If the distance between $Na^{+}$ and $CI^{-}$ ions in NaCl crystal is ‘$a$’ pm what is the length of the cell edge?
A) $4a\ pm$
B) $\frac{a}{4}\ pm$
C) $2a\ pm$
D) $\frac{a}{2}pm$
Explanation
(c)
Length of the edge of $NaCl$ unit cell,
$= 2 \times$ distance between $Na^{+}\$and $CI^{-}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.