The electrons contribute 0.027 23 % of the mass of a C-12 atom.
The percent by mass of a component is the percent of the total mass of the compound that is due to that component.
% by mass = (mass of component/total mass) × 100 %
Mass of 6 electrons = (6 electrons/1 atom) × ((1/1836 u)/1 electron) = 3.268 × 10⁻³ u.
Total mass of C-12 atom = 12 u
% by mass = mass of electrons/total mass × 100 % =
##(3.268 × 10⁻³ u)/(12 u) × 100 %## = 0.027 23 %
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