Each electron provides a charge of -1.602 × 10^-19 coulombs.
If there are 8.51 × 10^-6 extra electrons:
1 electron ____________ -1.602 × 10^-19 coulombs
8.51 × 10^6 electrons___x = -1.602 × 10^-19*8.51 × 10^6/1=-1.32×
10^-12 coulombs
So the extra electrons provide a charge of 1.32× 10^-12
coulombs.
So the net charge is -1.32× 10^-12 coulombs (there are more
electrons besides those extra electrons, but there are also protons, so they
don’t affect the net charge – the other electrons just compensate the charge of
the protons).
