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Answer:picogramsExplanation:Mass of a proton =kilogramsSince 1 kilo = 1000 = 10³, we can write:Mass of a proton =grams =gramsWe need to convert the mass of proton to picogramsRemember that pic stands forSo, 1 picogram =gramWe can re-write the mass of proton as:Thus,Mass on proton in ispicograms...