The Elementary Charge is given by:
[tex]e=1.6*10^{-19}[/tex]
In the alpha particle there are two protons, so the total charge will be:
[tex]C=e+e \\ C=2*1.6*10^{-19} \\ \boxed {C=3.2*10^{-19}}[/tex]
Remember that the neutron has no charge, therefore not appear in the calculation.
Number 4
If you notice any mistake in my english, please let me know, because i am not native.
