Consider a crystal containing N identical atoms. As a crude approximation, assume that each atom is under the effect of a 3D harmonic potential which keeps it localized, and that atoms do not interact.
Which of the following statements best describes the behavior of the atoms in the crystal?
a) The atoms will remain localized due to the harmonic potential.
b) The atoms will interact with each other, leading to crystal lattice formation.
c) The atoms will undergo random motion within the crystal structure.
d) The atoms will undergo nuclear fusion reactions within the crystal lattice.