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Chapter 3: Problem 3

State the Pauli exclusion principle.

Short Answer

Expert verified
The Pauli Exclusion Principle states no two identical fermions (e.g. electrons in an atom) can have the same set of quantum numbers. This prevents them from occupying the same quantum state at the same time.

Step by step solution

01

Introduction to the Principle

The Pauli Exclusion Principle was formulated by Austrian physicist Wolfgang Pauli in 1925. This principle governs the behavior of fermions, which are a sub-type of elementary particles. Fermions include particles such as electrons, protons, and neutrons, which make up atoms.
02

Explanation of the Principle

The Pauli Exclusion Principle states that no two identical fermions (particles with half-integer spin) can occupy the same quantum state simultaneously. In the context of an atom, this means that no two electrons in an atom can have the same set of quantum numbers.
03

Impact of the Principle

This principle is fundamental in the development of the theory of the structure of atoms. For example, it explains the structure of the periodic table, and why some elements are more chemically active than others.

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