What is an electron? Definition:

On electron (e-), synonymous as well Negatron is an electrically negatively charged elementary particle. The term derives from the English term 'electron' (etymologically from the word 'electric' = 'electrical').
With a mass of 0.0005 u, electrons are about 2000 times smaller than protons or neutrons. Electrons revolve around the atomic nucleus, so they are in the atomic shell or electron shell. Their corresponding antiparticle is the positron.
The electron configuration, ie the number and distribution of the electrons in the electron shell, is decisive for the chemical properties of the atom.
For a long time, electrons were considered indivisible elementary, In 2014, apparently physicists from the Helmholtz Center Berlin managed to split electrons into two quasiparticles (orbitone and spinon). This was not observed directly, since electron microscopes are far from able to represent single electrons. Rather, the division was measured and detected electrically.
Under natural conditions it can be assumed that electrons do not divide into orbitone and spinon. In this context certainly debatable, whether one should continue to call electrons as elementary particles or not.
Interesting: Furthermore, electrons are a central component in the development of the television and computer monitor dar. In the cathode ray tube electrons rush through a vacuum in the electric field and hit a phosphor layer. This results in a bundled electron beam, which is responsible for the emission of light. The property that electrons in the magnetic field are directed perpendicular to the field direction and perpendicular to the current direction of flight makes it possible to produce a visible image.