Name the particles which determine the mass of an atom. ?

 

the electrons present in it has very less mass as compared to that of proton and hence it is not considered while calculation Atomic mass.

Mass of a Electron = (1/1849) times of proton 

So The mass is protons and neutrons present in a atom is only considered as the mass of an atom 

Atomic mass = mass of neutron+ mass of proton.

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