Changes

'''Protons''' are one of the two types of [[sub-atomic particles]] that form in the [[nucleus]] of an [[atom]] (together with [[neutron]]s).<ref>Serway, Beichner: ''Physics for Scientists and Engineers'', 5th edition</ref>

'''Protons''' are one of the two types of [[subatomic particles]] that form in the [[nucleus]] of an [[atom]] (together with [[neutron]]s).<ref>Serway, Beichner: ''Physics for Scientists and Engineers'', 5th edition</ref>

A proton is made up of two up [[quark]]s 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]]s 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>

[[Category:Chemistry]]

[[Category:Chemistry]]

[[Category:Physics]]

[[Category:Physics]]