Question

Copper crystallizes in face-centered cubic structure. If the unit cell length is $360pm$, the radius of the copper atom is:

• A. $127pm$
• B. $280pm$
• C. $150pm$
• D. $430pm$

Answer 1

Answer: (A)

$127pm$

For a $FCC$ crystal

$4r=\sqrt{2}\times a$ or $r=\frac{\sqrt{2}\times a}{4}$

$r=\frac{\sqrt{2}\times 360}{4}$ or $r=127.26A^o$