What governs the packing of particles in crystals?

In the closest packing of atoms

(a) Calculate the packing efficiency in c ccp crystal lattice. (b) What is the number of particles per unit cell of a simple cube.

What is packing efficiency in a crystal ? Draw the unit cell of a simple cubic lattice and calculate the packing efficiency in a simple cubic lattice.

a) Calculate the packing efficiency of particles in a body centred cube.

What is a particle?

What is the acceleration of a particle at the mean position?

What is the charge of an alpha particle?

What are alpha particles ?