Why can metal rods not be charged by holding them in hands?

When a piece of polythene is rubbed with wool,a charge of $-2 \times 10^{-7} \ C$ is developed on the polythene. What is the amount of mass transferred to the polythene?

Number of electrons in one coulomb of charge will be

The charge on an $\alpha$-particle is:

The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by

We have three identical metallic spheres $A, B$ and $C$. $A$ is given a charge $Q$,and $B$ and $C$ are uncharged. The following processes of touching of two spheres are carried out in succession. Each process is carried out with sufficient time.
$(i)$ $A$ and $B$
$(ii)$ $B$ and $C$
$(iii)$ $C$ and $A$
$(iv)$ $A$ and $B$
$(v)$ $B$ and $C$
The final charges on the spheres are