Conservation of charge:

We can double check that the charge on a proton is equal to the sum of the charges on the individual quarks:

PROTON:

Charge on the quarks:   

  Charge on a proton
  +  +  = 
U   + U   + D = PROTON

                                                                                                                          

NEUTRON:

Charge on the quarks:   

  Charge on a neutron
  +  +  = 
U   + D    + D =   NEUTRON

                                            

Press the button to check your answers:

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