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The difference is quite large. The helium nucleus (using He4 for fun) contains two protons and two neutrons. The two electrons are way out there happily tucked into there orbitals. A proton is roughly 1825 times more massive than an electron. A neutron is slightly more massive than a proton (by an amount approximately equal to the mass of an electron, as it turns out -- and don't you want to know why?). 4 x 1825 = 7300 The nucleus of a helium four atom is about 7300 times more massive than the electrons in that atom.

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