$(i)$ Name the scientist who discovered neutrons.
$(ii)$ State the charge and mass of a neutron.
$(iii)$ Where is a neutron located in an atom?

(N/A) $(i)$ The scientist who discovered neutrons is $J. Chadwick$.
$(ii)$ $A$ neutron has no electric charge (it is neutral) and its mass is approximately $1.67 \times 10^{-27} \text{ kg}$, which is nearly equal to the mass of a proton.
$(iii)$ Neutrons are located inside the nucleus of an atom along with protons.