Mass of proton (p)=1.6726×10−27‌kg Mass of neutron (n)=1.6749×10−27‌kg Mass of electron (e)=9.1×10−31‌kg Mass of proton is 1836.16 times heavier than electron. Mass of neutron is 1838.68 times heavier than electron. Ratio of mass of electron, proton and neutron will be Mass of e : Mass of p : Mass of n 1:1836.16:1838.68