ANSWERS: 1
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The atomic mass of a proton is 1.6726 x 10 ^-27 kg. Other atomic particles include electrons with a mass of .00091 x 10^ -27kg and neutrons (which contain both protons and electrons) that weigh 1.6749 x 10^ -27kg.
Source:
At Long Last, Physicists Calculate a Proton's Mass by Adrian Cho; Science Magazine; 21Nov. 2008
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