zero, $1.673 \times 10^{-27}kg$

$1.673 \times 10^{-27} coul, 1.6 \times 10^{-19} kg$

$1.6 \times 10^{-19} coul, 1.673 \times 10^{-27} kg$

$9.1 \times 10^{-31} kg, 1.67 \times 10^{-27} coul$