The mass of electron, proton and neutron in grams are :
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An electron is a tiny particle with a mass of 9.108×10−28 g and a negative charge. All neutral atoms contain electrons. The mass of a proton is 1.6726×10−24 g, or about 1836 times the mass of an electron. The proton carries a positive electrical charge, that is equal in magnitude to the charge of the electron but opposite in sign. Mass of a neutron is 1.675×10−24 g. It is very close to that of the proton. A neutron carries no charge.