write the names of three elementry particles which constitute an atom. Which of these particles determine the mass of an atom? justify your answer with an example
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The 3 basic, fundamental elementary particles in an atom are proton, neutron and electron.. The mass of an atom is contributed by protons and neutrons.. The first reason is, atomic mass = mass of protons + mass of neutrons present.. The second proof is the numerical data.. Mass of a proton and a neutron is approximately 1.67 *10^-27 kg with the neutron being slightly heavier while mass of an electron is 9.1*10^-31 kg
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