Transition metals are often paramagnetic owing to the presence of

Options

A. valency electrons in the outer two electrons shells
B. unpaired electrons in their atoms
C. vacant d orbitals in the n th orbit
D. electrons in d orbitals of the (n-1) orbit.

Answer

B

Explanation

A single spinning electron behaves like a small magnet. Two electrons that are paired in an orbital have opposite spins , and their magnetic moments oppose each other and cancel The magnetic properties of unpaired electrons cause paramagnetism in atoms containing such electrons. An atom is diamagnetic if all of its electrons are paired