what will be the atomic radius of copper, if the distance between two adjacent copper atoms in metallic…

what will be the atomic radius of copper, if the distance between two adjacent copper atoms in metallic copper is 256 pm?\na 128 pm\nb 256 pm\nc 512 pm\nd 140 pm
Answer
Explanation:
Step1: Recall atomic - radius concept
The distance between two adjacent atoms is equal to 2 times the atomic radius for simple - cubic and some other arrangements. Let the atomic radius be $r$ and the distance between two adjacent atoms be $d$. Then $d = 2r$.
Step2: Solve for atomic radius
Given $d=256$ pm, we can solve for $r$ using the formula $r=\frac{d}{2}$. Substituting $d = 256$ pm into the formula, we get $r=\frac{256}{2}=128$ pm.
Answer:
A. 128 pm