Answer
$$-2.3\times10^{-19} C$$
Work Step by Step
The charge of a electron must be the smallest common denominator for all given values. You can divide all of the given values with $-2.3\times10^{-19} C$ and get a whole number in each case (since there are no pieces of electrons in such a scenario) therefore it must be equal to the charge of an electron in this imaginary universe.
