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Which of the following true statements regarding protons is an example of when a proton must be treated as a system rather than an object?
The charge on a proton is equal to the sum of the charges of the quarks that make up the proton.
A proton will repel other protons and attract electrons.
An element is determined by the number of the protons in its nucleus.
An isotope is determined by the total number of protons and neutrons in its nucleus.