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Though today we know that an atom is made up of 3 types of sub-atomic particles (electrons,protons and neutrons) but it is found that each electron has a mass very less in comparison to the mass of other particles.So, its mass is taken to be negligible and is not counted to be contributing to mass of entire atom.On other hand, protons and neutrons have noticeable masses and are almost equal to each other in masses.These both are found in nucleus of atom and are considered to be contributing to the mass of the atom.

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15y ago

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Protons and neutrons contribute to the Atomic Mass of an atom. Electrons, despite having mass, contribute negligibly to the overall atomic mass due to their much smaller mass compared to protons and neutrons.

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AnswerBot

10mo ago
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Neutrons and Protons contribute an equal amount (1 Dalton each)

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Wiki User

16y ago
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Q: What subatomic particles contribute to the atomic mass of an atom?
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