a. the mass of each particle was given, but the value for the mass of the electron is less precise, so we have to round the figure for the proton to four decimal places. So, the proton has a mass of 1.6726 x 10-27, and the electron remains at 9.1095 x 10-31
b.recognizing that the mass of a proton is greater than the mass of an electron, we must change the mass figure accordingly. So, the mass of an electron is 0.00091095 x 10-27
the sum of the two masses is 1.6726 x 10-27 + 0.00091095 x 10-27 = 1.6735 x 10-27
c. to determine how much greater the mass of a proton is, we divide the two numbers. So, the mass of a proton divided by the mass of an electron yields ≅1,836
