The electron is a fundamental particle, and according to our current understanding, it is considered to be a point particle with no known internal structure. Therefore, it does not have a well-defined size or radius in the traditional sense.
In terms of rotation, the concept of an electron spinning on its axis is not accurate in the context of elementary particles. Classical objects, such as a spinning top, have a well-defined angular momentum associated with their rotation. However, quantum particles like electrons do not have a classical analog for their rotational properties.
In quantum mechanics, particles are described by wavefunctions that contain information about their properties. The intrinsic angular momentum of a particle, known as spin, is a fundamental property of particles like the electron. Spin is not a physical rotation in the traditional sense but represents an intrinsic angular momentum that cannot be directly related to spinning on an axis.
The spin of an electron is quantized, meaning it can only have specific values according to the rules of quantum mechanics. The electron has a spin of 1/2, which is often described as "up" or "down" spin states. However, it's important to note that spin does not refer to a physical rotation in space.
So, while the electron does not have a well-defined radius or rotational speed, it does possess spin, which is a fundamental quantum property of elementary particles.