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For simplicity in the study of basic chemistry, atoms are said to consist of protons, electrons and neutrons, of which only protons and neutrons are considered to contribute to the element's atomic weight - that is, the electrons are considered to have essentially no mass are not accounted for when calculating atomic weight due to being overwhelmingly smaller than protons and neutrons.

There are other particles to be considered but that will come in more advanced physical chemistry physics studies.

EDIT: Corrected and added information.

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