The primary difference between Rutherford's model and Bohr's model of the atom is how the electrons in an atom move around the nucleus.
In Rutherford's model, electrons were thought to move in any orbit around the nucleus, similar to planets orbiting the sun, with no quantized paths. In contrast, Bohr's model proposed that electrons occupy specific, quantized energy levels or orbits around the nucleus, with restrictions on their allowed energies. This introduced the concept of quantization in atomic structure, fundamentally altering the understanding of atomic behavior.