Using your largest spheres, construct a single cubic unit cell lattice. using dots to represent the center of each atom, draw a diagram to represent your model
how many atoms are contained in the sample cubic unit cell
express the length of the side of the cube in term of sphere radii
express the body diagonal (BD) of your unit cell in term of sphere radii
calculate the volume of the simple cube unit cell in term of sphere radii
calculate the volume actually occupied by spheres in the sample cubic unit cell in term of sphere radii
the spheres occupy what % of the total available volume in the simple cubic cell