Explain paramagnetism on the basis of electron theory.

Explain ferromagnetism on the basis of domain theory.

Explain the magnetism on the basis of atomic theory.

Explain magnetism on the basis of atomic theory.

Name one material whose resistivity decreases with rise in temperature. Explain briefly on the basis of free electron theory why the resistivity decreases.

Explain origin of paramagnetism on the basis of its atomic structure.

Account for the malleability and ductility of metals on the basis of electron gas theory.