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From this image can be deduced the quark-content of the proton. Forces between quarks are mediated by gluons.
A proton is composed of two up quarks and one down quark.
The word "proton" is Greek for "first." This name was given to the hydrogen nucleus in 1920 by Ernest Rutherford.
The proton has a mass slightly less than that of the neutron. Protons and neutrons each have a mass of approximately one atomic mass unit. They are collectively referred to as nucleons. These are particles present in atomic nuclei.
One or more protons are required in the nucleus of every individual atom. They are a necessary part of the atomic nucleus. The number of protons in an atom will determine which chemical element it is. This is referred to as the atomic number. As each atomic nucleus has a unique number of protons, each element has a unique atomic number.
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