Question -
Answer -
(i) What is the length of the side of the unit cell?
(ii) How many unit cells are there in 1.00 cm_3 of aluminium?
Answer
(i) For cubic close-packed structure:
= 353.55 pm
= 354 pm (approximately)
(ii) Volume of one unit cell = (354 pm)3
= 4.4 × 107 pm3
= 4.4 × 107 × 10−30 cm3
= 4.4 × 10−23 cm3
Therefore, number ofunit cells in 1.00 cm3 =
= 2.27 × 1022