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Reflect on electrons
Electrons are subatomic particles. The standard model of particle physics describes electrons as elementary fermions with intrinsic angular momentum, spin ½ ħ and charge -e (elementary charged leptons), or two up quarks and one down antiquark (the respective components of the electron). It is a fundamental particle which has an antiparticle of opposite charge.
As a free electron, having only intrinsic spin and no orbital angular momentum, it is described by the Dirac equation. This equation also provides accurate descriptions for many other elementary particles".
The electrons are the lightest particles. They have a mass of magnitude 9109765808800000000♠9.1097750×10−31 kg, or about 0.0005% of the mass of an atom (whose mass is roughly 1 g). Electrons and their interactions are described by quantum mechanics.
The electric charge of the electron is negative, equal in magnitude to the elementary charge (the unit of positive and negative charges). Electrons carry an electric current through wires, which in turn produces a magnetic field. The intrinsic angular momentum or spin quantum number s distinguishes electrons from other particles that are negatively charged.
The electron is a fermion, and therefore has an intrinsic spin of ½. It generates a magnetic field that causes the electrons to form atoms through magnetism.
They are created by cosmic rays in the Van Allen radiation belts around Earth and other planets.