exclusion principle
Definition
Noun: A fundamental principle in quantum mechanics stating that no two identical fermions (particles 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 quantum numbers.
Usage
The term is used primarily in the context of physics and chemistry to explain the structure of atoms, the periodic table of elements, and the behavior of matter at the subatomic level. - The exclusion principle explains why electrons occupy different orbitals within an atom. - According to the exclusion principle, two electrons in the same orbital must have opposite spins.
Advanced Usage
- Pauli Exclusion Principle: This is the full and more precise name for the principle, named after the physicist Wolfgang Pauli who formulated it.
- The Pauli Exclusion Principle is a cornerstone of quantum statistics.
Variants and Related Words
- Pauli principle (n): A common synonym for the exclusion principle.
- Exchange interaction (n): A quantum mechanical effect related to the symmetry requirements underlying the exclusion principle.
Synonyms
- Pauli Exclusion Principle
- Pauli principle
Related Concepts (Not Phrasal Verbs or Idioms)
- Quantum state: The condition of a system as described by its quantum numbers.
- Fermion: A type of particle, such as an electron or proton, that obeys the exclusion principle.
- Boson: A type of particle, such as a photon, that does obey the exclusion principle.
Noun
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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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