Option 1 states that the mass of a neutron is almost equal to the mass of a proton. This is correct. Neutrons and protons have similar masses, with neutrons being slightly more massive than protons.

Option 2 states that neutrons possess zero charge. This is also correct. Neutrons are electrically neutral particles, meaning they have no charge.

Option 3 states that neutrons are located inside the atomic nuclei. This is correct. Neutrons, along with protons, make up the nucleus of an atom. They are tightly bound inside the nucleus.

Option 4, the correct answer, states that neutrons revolve around the atomic nuclei. This is not correct. Neutrons do not revolve or orbit around the atomic nuclei like electrons do in the electron cloud. Instead, neutrons are found within the nucleus itself.

In conclusion, option 4 is the correct answer because neutrons do not revolve around the atomic nuclei.