Final answer:
The statement is false. Magnetic materials have unpaired electrons in their outermost energy level, allowing them to exhibit magnetic properties. Diamagnetic materials have all their electrons paired, making them weakly repel a magnetic field.
Step-by-step explanation:
The statement that most metals are not magnetic because their atoms tend to pair off in orbits with opposite spins so that their magnetic fields cancel each other is False.
Magnetic materials, such as iron, nickel, and cobalt, have unpaired electrons in their outermost energy level. These unpaired electrons create a net magnetic moment, resulting in the material being able to exhibit magnetic properties.
On the other hand, diamagnetic materials have all their electrons paired, so their magnetic fields cancel each other out, making them weakly repel a magnetic field.