Electron - definition

Electron is a fundamental elementary particle with a negative electric charge, belonging to the group of leptons, with a mass of approximately 9.109 × 10⁻³¹ kg, and its electric charge is equal to the absolute value of the proton's charge, which is -1.602 × 10⁻¹⁹ C. Its wave-particle nature, according to the principle of wave-particle duality, means that depending on experimental conditions, it can exhibit properties of both a particle and a wave. In quantum mechanics, the electron is described by a wave function, whose amplitude determines the probability of its location in space.

In the atomic structure, electrons are arranged in electron shells around the nucleus, where they occupy orbital energy states according to quantum rules defined by quantum numbers. Their configuration determines the chemical properties of elements, and phenomena such as orbital hybridization or electron resonance determine the mechanisms of chemical bonding. Electrons in atoms can transition between energy levels as a result of absorption or emission of electromagnetic radiation quanta, which is the basis of atomic spectroscopy and the photoelectric effect, providing evidence of the quantum nature of light.

In metallic conductors, free electrons form an electron gas, whose movement is described by the electron conduction model. Their collective behavior in the presence of an electric field enables charge transport, which is the basis of the phenomenon of electric current. Effects such as quantum tunneling, spintronics, or quantum entanglement arise from the quantum properties of electrons and find applications in modern microelectronic technologies and in quantum computers.

Interactions of electrons with other particles are described within the framework of quantum electrodynamics (QED), where electromagnetic interaction is realized through the exchange of virtual photons. Annihilation of an electron with a positron, its antiparticle with the same mass but opposite charge, leads to the emission of gamma radiation, which is a significant mechanism in particle physics and in applications such as positron emission tomography (PET).

The stability of the electron and its fundamental role in the structure of matter make it one of the key objects of study in high-energy physics, astrophysics, and nanotechnology, where its behavior on the nanoscale allows for the development of semiconductor, optoelectronic technologies, and quantum communication systems.

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