why the word exclusion is used in pauli's principle
Answers
It means that there is a class of particles (called fermions) for which it is impossible to have two (or more) with the same quantum state (in all respects: energy, spin, etc.) at the same place. So one fermion excludes another. Another class of particles called bosons don’t bother with that, they are happy together. The most famous boson is the photon.
Fermions have spin 1/2 (or 3/2 etc). So for example in the lowest energy state in an atom that has only one spatial orientation (spherically symmetric) there can be two electrons: one with spin up and one with spin down.
Explanation:
➡The Pauli exclusion principle is the quantum mechanical principle which states that two or more identical fermions (particles with half-integer spin) cannot occupy the same quantum state within a quantum system simultaneously.
➡Example of the Pauli Exclusion Principle
The exclusion principle asserts that every electron in an argon atom is in a unique state. The 2s level electrons have a different principal quantum number to those in the 1s orbital. The pair of 2s electrons differ from each other because they have opposite spins.
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