Aluminium crystallises in a cubic close-packed structure. Radius of the atom in the metal is 125 pm. (i) What is the length of the side of the unit cell? (ii) How many unit cells are there in 1 cm3 of aluminium?
Aluminium crystallises in a cubic close-packed structure
Volume of one unit cell = a3 = (3.54× 10–8 cm)3 = 4.436 × 10–23cm3 = 4.44 cm3
