Paramagnetic ions common among transition elements but not main-group elements because transition elements contain one or more unpaired electrons in their (n-1)d orbitals and show paramagnetic behavior. The magnetic moment due to unpaired electron spins are aligned parallel to the external magnetic field more effectively resulting in an exceptionally strong reinforcement of Para magnetism in transition elements than in other elements.
Para magnetism is a form of magnetism whereby some materials are weakly attracted by an externally applied magnetic field, and form internal, induced magnetic fields in the direction of the applied magnetic field.
Whereas, diamagnetic materials are repelled by magnetic fields and form induced magnetic fields in the direction opposite to that of the applied magnetic field.
Para magnetism is due to the presence of unpaired electrons in the material, so most atoms with incompletely filled atomic orbitals are paramagnetic, although exceptions such as copper exist.
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