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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   +  + D = PROTON

                                                                                                                          

NEUTRON:

Charge on the quarks:   

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

                                            

Press the button to check your answers:

click to submit score to Mr. Lindley

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