What is the circumference of an electron?

Answer 1

The diameter is double the radius. Radius of an electron r = 2.817940289458 x 10^-15 m Diameter of an electron d = 5.635880578916 x 10^-15 m http://en.wikipedia.org/wiki/Classical_electron_radius http://scienceworld.wolfram.com/physics/ElectronRadius.html

Answer 2

Electrons are point particles. They have no classical spatial dimensions and so therefore have no circumference. The way you discuss an electron's size is through the quantity known as cross-section. An electron's cross-section is its probability to interact with a target / (number density of the target * how far it travels per interaction). This statement is expressed mathematically as:

cross section = s = ln(I0/I)/(n*l),

where I0 is the initial electron flux, I is the final electron flux, n is the number density and l is the mean free path.

It turns out that after experimentally obtaining these values, via Thompson scattering, the electron's cross section is 7.94 X 10-26 cm2, thus giving it a "cross sectional diameter" of 1.59 X 10-13 cm

Keep in mind, though, that this "diameter" has no actual spatial representation.