The classical electron radius is the length scale formed from the elementary charge, vacuum permittivity, electron mass and speed of light. It is not a measured material radius of an Electron. In the classical low-energy scattering model it sets the Thomson cross-section, .
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The classical electron radius, often denoted by \( r_e \), is a theoretical value that represents a length scale associated with the size of an electron based on classical physics principles. It can be derived from the electron's charge and mass, along with fundamental constants.