The following table gives the masses (in kg) of various particles which make up an atom.
(Neutron) 1.675 x 10^-27
(Proton) 1.673 x 10^-27
(Electron) 9.109 x 10^-31
1) find the average (mean) mass of all three particles, giving your answer in standard form (scientific notation) to 3 sf. 2) calculate the percentage error in taking the mass of an electron to be 1 x 10^30kg.
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