Question
Is a charge of $-3.6 \times 10^{-18} C$ possible?

Answer

$Q = n e$
$N = Q/ e = -3.6 x 10^{-18} /1.6 x 10^{-19} = 22.5$
Since n is not an integral value so this value of the charge is not possible because the charge is quantized.

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