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Line 1: − '''Protons''' are one of the two types of [[sub-atomic]] particles that form in the [[nucleus]] of an [[atom]] (together with [[neutron|neutrons]]).<ref>Serway, Beichner: ''Physics for Scientists and Engineers'', 5th edition</ref> − A proton is made up of two up [[quark|quarks]] and one down [[quark]]. According to the [[Standard Model]] of particle physics, quarks are [[fundamental particles]], meaning that they cannot be split into smaller particles.<ref>Krane: ''Modern Physics'', 2nd edition</ref> − − ==Properties== − *Mass: 1.6726231*10<sup>-27</sup> [[kilogram|kg]] − *Charge: 1.60218925*10<sup>-19</sup> [[Couloumb|C]] − − ==References== − <references/> − − ==See Also== − − *[[Atom]] − *[[Neutron]] − *[[Electron]] − *[[Periodic table of the elements]] − *[[Quark]] − − [[Category:Chemistry]] − [[Category:Physics]]
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