Question

The edge length of fee type unit cell of copper having an atomic radius of 127.6 pm is equal to ______

Options

• 361 pm

• 295 pm

• 331 pm

• 378 pm

Answer 1

The edge length of fee type unit cell of copper having an atomic radius of 127.6 pm is equal to 361 pm.

Explanation:

For fcc type of unit cell, r = `sqrt2/4`a = 0.3535 a

∴ a = `127.6/0.3535 = 360.96 ≈ 361` pm