Question

What is quantization of charge ? Why a charge equals to $1\times {10}^{-19}$ is not likely to exist on a body ?

Answer 1

Quantization of charge states that charge (q) on a body exists as an integral multiple of charge on one electron (e).
Mathematically it can be expressed as
q = n e
Where,
e = charge on one electron = $1.6\times {10}^{-19}$
n = 0 , 1 , 2 ............... (postive or negative integers )

Suppose charge on a body is $1\times {10}^{-19}$,
For this case,
$n=\frac{q}{e}=\frac{1\times {10}^{-19}}{1.6\times {10}^{-19}}=0.625$
As, n = 0.625 is not an integer, so this amount of charge is not possible to exist on a body.