1. In quantum mechanics, particles that have the same intrinsic properties (such as mass, charge, and spin) and are fundamentally indistinguishable from one another, making it impossible to track which particle is which
Electrons are identical particles, so we cannot distinguish between them in a quantum system
Os elétrons são partículas idênticas, portanto não podemos distingui-los em um sistema quântico
2. Particles for which the exchange of any two particles does not change the physical state of the system
The behavior of identical particles is governed by quantum statistics, either Bose-Einstein or Fermi-Dirac statistics
O comportamento de partículas idênticas é governado pela estatística quântica, seja estatística de Bose-Einstein ou Fermi-Dirac
This is a specialized scientific term used primarily in physics education and research contexts in both Brazil and Portugal. The concept is fundamental to quantum mechanics and is taught at the undergraduate level in physics programs. The term reflects the paradigm shift from classical to quantum physics where the notion of particle identity fundamentally changes.