Question

Silver crystallizes in face centred cubic structure, if radius of silver atom is 144.5 pm. What is the edge length of unit cell?

Options

• 408.6 pm

• 289.0 pm

• 428.6 pm

• 333.7 pm

Answer 1

408.6 pm

Explanation:

For FCC , r = `(sqrt2"a")/4` = 0.3535 a

144.5 = 0.3535 a

∴ a = 408.7 pm