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Sep5-04, 12:39 AM
P: 253
Proton and neutron

Quote Quote by Atheist
It is. Free neutrons are even unstable and decay with a lifetime of something like 12min. To my big surprise, when I looked it up, the mass-difference was much more than I expected: 2.5 times the mass of an electron (I expected not much more than the electron mass).
This is impossible, the mass of the proton is 1.67262158 10-27 kilograms, while the mass of the electron is 9.10938188 10-31 kilograms. This means that the proton has a mass more than 10^4 times that of the electron.