Assertion: proton | /r/HasAspect | a mass of 1.00728 amu
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Source sentences:
text: Mass defect (M d ) can be calculated as the difference between observed atomic mass (m o ) and that expected from the combined masses of its protons (m p , each proton having a mass of 1.00728 amu) and neutrons (m n , 1.00867 amu):