Proton decays into neutron, neutron mass is more than proton, from where extra mass comes. violation of law of conservation of mass
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Answer:Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron). The positive charge on a proton is equal in magnitude to the negative charge on an electron. The neutron is made of two down quarks and an up quark; the proton of two up quarks and a down quark. ... So, it's mostly the fact that the down quark is heavier than the up quark that makes the neutron heavier than the proton.For example, beta decay of a neutron transforms it into a proton by the emission of an electron accompanied by an antineutrino; or, conversely a proton is converted into a neutron by the emission of a positron with a neutrino in so-called positron emission.
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