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Paramagnetism and diamagnetism are properties of materials related to their response to magnetic fields. Paramagnetic materials are weakly attracted to magnetic fields, while diamagnetic materials are weakly repelled by them. The difference in behavior arises from the arrangement of electrons in the atoms of each material.

Every atom consists of protons, neutrons, and electrons. Electrons are arranged in specific orbits or energy levels around the nucleus, and their arrangement determines the material's properties. The key difference between paramagnetic and diamagnetic materials lies in their electron configurations. In a paramagnetic material, the atoms or ions have unpaired electrons, which means one or more of their electron orbitals have an odd number of electrons. These unpaired electrons create a magnetic moment, which causes these materials to be weakly attracted to an external magnetic field. On the other hand, diamagnetic materials have all their atomic orbits or energy levels completely filled with electrons. All the electrons in diamagnetic materials exist in pairs with opposite spins, resulting in the cancellation of their magnetic moments. This leads to a net zero magnetic moment.

When an external magnetic field is applied, paramagnetic and diamagnetic materials respond differently. For paramagnetic materials, their unpaired electrons align with the magnetic field, causing a slight magnetization parallel to the field. The strength of the effect is generally small, and the material loses its magnetization once the external field is removed. Diamagnetic materials, on the other hand, always have a negative response to an external magnetic field. The diamagnetic material opposes the applied field and develops a weak magnetic field of its own that points in the opposite direction of the external field. This weak magnetization results in a repulsive force, causing diamagnetic materials to be weakly repelled by a magnetic field. This effect is also temporary and disappears once the external field is removed. In summary, the key difference between paramagnetic and diamagnetic materials lies in their electron configurations: paramagnetic materials have unpaired electrons and are attracted towards magnetic fields, while diamagnetic materials have completely filled electron orbits and are repelled from magnetic fields.