45107cbe_s___Physics___Particle_Physics__Answer
[Date Answered] January 2, 2008 [Questioner (age, location)] Susan (China) [Question] What is the size of an electron, proton and neutron? [Answer] 
The mass of an electron is 9.10938188 x 10-31 kilograms. Neutron and proton are nearly equal in size, with masses of 1.6726231 x 10-27 kg for the proton, and 1.6746286 x 10-27 kg for the neutron.
Quickie Questions - Physics - Particle Physics
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