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Matter and antimatter… Jul 26, 2020 physics & atoms & ks5 & lesson materials charge in coulombs relative to a proton mass in kilograms relative to a proton proton neutron electron All particles of Some Basics Jul 26, 2020 physics & lesson materials & ks5 Reading: Physical QuantityUnit NameSymbolNameSymbolmassmkilogramkglengthxmetremtimetsecondselectric currentIampereAtemperature