Changes

An [[atom]] is made of three particles, protons, [[neutron|neutrons]], and [[electron|electrons]].  Protons and [[neutron|neutrons]] make up the nucleus of the atom.<ref>Serway, Beichner: ''Physics for Scientists and Engineers'', 5th edition</ref>

Protons are one of the two types of [[sub-atomic]] particles that can exist 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>

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==

==Properties==

*mass: 1.6726231e-27 kg

*Mass: 1.6726231*10^-27 [[kilogram|kg]]

*charge: 1.60218925e-19 C

*Charge: 1.60218925*10^-19 [[Couloumb|C]]

==References==

==References==

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[[Category:Physics]]

[[Category:Physics]]

[[Category:Chemistry]]

[[Category:Chemistry]]