(i) Charge on one proton = 1.6 × 10−19 C
Number of protons present in He = 2
\(\therefore\) Charge on 2 protons = 2 × 1.6 × 10−19
= 3.2 × 10−19 Coulomb
(ii) Number of protons present in Li = 3
\(\therefore\) Charge on 3 protons = 3 × 1.6 × 10−19
= 4.8 × 10−10 Coulomb
(iii) Number of protons present in C = 6
\(\therefore\) Charge on 6 protons = 6 × 1.6 × 10−19
= 9.6 × 1019 Coulomb