The magnitude of the charge of a single electron or proton is 1.6×10−19C. What is the net charge of a particle that has 20 electrons and 22 protons?
Protons carry a positive charge. Hence, the charge of each proton will be +1.6×10−19C
Electrons carry a negative charge. Hence, the charge of each electron will be −1.6×10−19C
Now the net charge of any particle is the sum total of all charges present in the particle.
The net charge of the particle in this case will be the sum total of charges of 22 protons and 20 electrons.