| Because of its spin, an electron must obey a fundamental requirement known as the Pauli exclusion principle. |
| The Pauli exclusion principle does not apply, however, to particles with integral spin, known as bosons, such as photons. |
| The Pauli Exclusion Principle simply states that no two fermions may exist in the same energy state. |
| In addition to electrons, the Pauli exclusion principle applies to all sub-atomic particles with half-integral spins, known as fermions, such as neutrons and protons. |
| For electrons, the Pauli exclusion principle paradoxically leads to an effective attraction that balances the particles' electrostatic repulsion at short distances. |
| The omega-minus particle, according to the Pauli exclusion principle, should not exist. |
