The Six Quarks 

and their charge

Baryon

Neutron

Proton 

Mesons 

 Construction of a Hadron

     Baryons are hadrons composed of three quarks. Baryons are either entirely standard quarks or anti-quarks never a mixture of the two.  The total charge of the any baryon has to be either +1, 0, or -1 never a fraction.  The charge is determine sum of three charges This restricts the possible combination of quarks. 

     Proton = Up + Up + Down 

                  = +2/3  +2/3 -1/3 = +1 

Neutrons = Up + Down + Down 

                  = +2/3  -1/3  -1/3 = 0 

     Mesons are hadrons composed of two quarks. Mesons are a mixture of the standard quarks and anti-quarks and never solely standard quarks or anti-quarks.  The total charge of the any meson has to be either +1, 0, or -1 never a fraction.  The charge is determine sum of two charges This restricts the possible combination of quarks. 

First Generation 

Up      = +2/3 

Down = -1/3 

Second Generation

Strange = -1/3

Charm   = +2/3 

Third Generation 

Bottom  =  -1/3

Top        = +2/3  

Anti Quarks 

   Anti quarks have the same magnitude of charge just opposite sign