Question

Copper crystal has a face centred cubic structure. Atomic radius of copper atom is 128 pm. What is the density of copper metal? (Atomic mass of copper is 63.5)

Answer 1

Given: Atomic radius of Cu atom

= 128 pm

= 128 x 10−10 cm

z = 4 (FCC)

Atomic mass of Cu = 63.5

To find: Density of Cu (d) = ?

Formula: i. Face diagonal

Calculation:

For FCC Lattice In face centred cubic arrangement face diagonal is four times the radius of atoms face diagonal.