Question

Aluminium crystallizes in cubic close

packed structure with unit cell edge

length of 353.6 pm. What is the radius of

Al atom? How many unit cells are there

in 1.00 cm3

of Al?
​

Answer 1

Answer:

radius = 125 pm

number of cells in 1 cm3 = 2.27×10^22

Explanation:

We know Al crystallises in FCC structure.

For FCC a = r2√2

so r = a/2√2

r = 125 pm

now volume of 1 cube is equal to a^3

so Volume of unit cube is 4.4 × 10^ -23 cm^3

given volume of n unit cubes = 1cm^3

so n = 1/ volume of unit cube

n = 1/4.4 × 10^ -23