Answer
The charge of a proton is +1 and its mass is 1 amu.
The charge of a neutron is 0 and its mass is 1 amu.
The charge of a proton is -1 and its mass is $\frac{1}{1840}$ amu.
Work Step by Step
The proton is positively charged so its charge is +1. The electron is negatively charged so its charge is -1. The neutron has no charge so the charge is 0.
The mass of the proton and neutron is equal which is 1 amu each, whereas electron has a very low mass of only $\frac{1}{1840}$ amu
