pauli exclusion principle

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pauli exclusion principle

An electron orbits the nucleus of an atom, following the Pauli exclusion principle.

Definition
  1. Noun:
    • A fundamental principle in quantum mechanics: The Pauli exclusion principle states that no two identical fermions (particles with half-integer spin, such as electrons, protons, or neutrons) within a given quantum system can occupy the same quantum state simultaneously. This means they cannot have an identical set of all four quantum numbers (principal, azimuthal, magnetic, and spin).
Usage Examples
  • Noun:
    • The stability of matter and the structure of the periodic table are direct consequences of the Pauli exclusion principle.
    • According to the Pauli exclusion principle, two electrons in the same orbital must have opposite spins.
    • The Pauli exclusion principle is crucial for understanding white dwarf stars and neutron stars.
Advanced Usage
  • "to be governed by the Pauli exclusion principle": to have its behavior or structure determined by this rule.
    • The electron configuration in an atom is strictly governed by the Pauli exclusion principle.
Variants and Related Words

  • Exclusion principle (n): A common shortened form referring to the Pauli exclusion principle.

    • The exclusion principle prevents matter from collapsing into a very dense state.

  • Pauli principle (n): Another common abbreviated name for the Pauli exclusion principle.

    • The Pauli principle is a key concept in quantum statistics.
Synonyms
  • Quantum exclusion principle: A descriptive synonym emphasizing its origin in quantum theory.
Related Phrases
  • To violate the Pauli exclusion principle: An impossible scenario under standard quantum mechanics, often used in hypothetical discussions.
    • If a system were to violate the Pauli exclusion principle, its fundamental properties would be completely different.
Related Concepts (Not Idioms)
  • Fermi-Dirac statistics: The statistical mechanics that describe systems of particles obeying the Pauli exclusion principle.
  • Spin-statistics theorem: A more fundamental theorem in quantum field theory from which the Pauli exclusion principle for fermions is derived.
pauli exclusion principle

An electron orbits the nucleus of an atom, following the Pauli exclusion principle.

Noun
  1. no two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers

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