Question

The radius of an atom is $300\,pm$. If it crystallizes in a face-centered cubic lattice, length of the edge of the unit cell is

• A. $488.5\, pm$
• B. $848.5\, pm$
• C. $884.5\, pm$
• D. $484.5\, pm$

Answer 1

Answer: (B)

$848.5\, pm$

Answer 2

For $fcc, a_= 2 \sqrt{2} r = 2 \times 1.414 \times 300\, pm$
=848.4 pm