Ans. $e=1.6\times10^{-19}\,C\,\,and \,charge \,q=1\,C$
$\therefore number\,of\, elctors\, \,n=\frac{q}{e}$
$n=\frac{1}{1.6\times10^{-19}}$
$n=6.25\times10^{18}$