Paramagnetic substances : The magnetic properties of a substance arise due to the presence of electrons.
An electron while revolving around the nucleus, also spins around its own axis and generates a magnetic moment and magnetic properties.
If an atom or a molecule contains one or more unpaired electrons spinning in same direction, clockwise or anticlockwise, then the substance is associated with net magnetic moment and magnetic properties. They experience a net force of attraction when placed in the magnetic field. This phenomenon is called paramagnetism and the substance is said to be paramagnetic.
For example : Oxygen, Cu2+, Fe3+, Cr3+ are some examples of paramagnetic substances.
