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Diamagnetism & Paramagnetism: Definition & Explanation

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  • 0:02 Introduction
  • 0:49 Electron Configuration
  • 2:17 Diamagnetism vs Paramagnetism
  • 3:54 Lesson Summary
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Lesson Transcript
Instructor: Amy Lange

Amy has taught university-level earth science courses and has a PhD in Geology.

In this lesson, we learn more about electron configuration through the concepts of diamagnetism and paramagnetism. We will review electron structure in an atom, and define diamagnetism and paramagnetism.

Introduction

One of the ways in which you can create levitation is through diamagnetism. In this image, you see a man-made material called pyrolytic carbon floating over magnets. The reason this material levitates is because it is diamagnetic, which means that the material is repelled by an external magnetic force. This is the opposite of paramagnetism, where objects are attracted to external magnetic fields, much like the attraction between a magnet and a refrigerator.

In this lesson, we're going to examine why some substances are diamagnetic and some are paramagnetic. We'll learn more about the definition of these terms, and discover what they tell you about the properties of the substances.

Electron Configuration

To understand magnetism in atoms, we must review electron configurations. Electrons can be imagined as residing in fixed locations in an atomic structure known as orbitals. Each orbital can fit two electrons. The number of orbitals in each atom depends on the atom and the total number of electrons, which are reviewed in greater detail in another lesson. We'll simplify it by imagining that there are a fixed number of orbitals for each atom.

The way that electrons fill each orbital is characterized by several laws. For instance, Hund's rule states that the minor repulsion between the negatively-charged electrons will cause them to enter into separate orbitals of the same energy level before filling an orbital that already has an electron in it.

You should notice in these diagrams that electrons are shown as arrows pointing either up or down. The direction of this arrow is directly related to the electron's spin. The Pauli Exclusion Principle states that electrons filling the same orbital must have different spins because no two electrons can have the exact same quantum number. You can think of 'quantum number' as an electron's address. Because two electrons are in the same orbital, they must spin in separate directions to have a different quantum number.

Diamagnetism vs Paramagnetism

So, what does this have to do with levitating material? It turns out that the presence or absence of unpaired electrons in orbitals will give them different properties. Diamagnetic atoms have no unpaired electrons. Paramagnetic atoms have unpaired electrons.

When an orbital is filled with two electrons spinning in different directions, the total net spin of that orbital is zero. When the orbital only has one electron that is spinning, it has a net spin in that direction. If an atom has only one unpaired electron, it is still a paramagnetic atom. To be diamagnetic, all electrons must be paired.

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