It becomes an isotope.

It gives a more intense buzz than regular N2O

It would become an isotope of nitrogen. Remember that the number of protons is what makes the identity of atoms. Nitrogen is nitrogen because it contains 7 protons. So if that number changed we would be talking about a different element. Now generally we think of an atom containing the same number of neutrons as protons but the number of neutrons can vary. If it gained neutrons its mass would change but it would still be nitrogen. We would then call it an isotope of nitrogen. Does having more neutrons change the chemistry of the situation? Sometimes. There is what is known as the isotope effect, sometimes chemical reactions can be slowed because of different isotopes etc. In some instances the difference is negligible. Isotopes can be used in certain situations like NMR spectroscopy to mask a particular atoms signal. Isotopes occur naturally but usually make up only a small percentage of a particular element.

Neutrons are neutral.So it will have an increase in mass number.Resulting in the formation of an isotope.

1) "There are two stable isotopes of nitrogen: 14N and 15N. By far the most common is 14N (99.634%), which is produced in the CNO cycle in stars. Of the ten isotopes produced synthetically, 13N has a half life of ten minutes and the remaining isotopes have half lives on the order of seconds or less. Biologically-mediated reactions (e.g., assimilation, nitrification, and denitrification) strongly control nitrogen dynamics in the soil. These reactions typically result in 15N enrichment of the substrate and depletion of the product. 0.73% of the molecular nitrogen in Earth's atmosphere is comprised of the isotopologue 14N15N and almost all the rest is 14N2. Radioisotope 16N is the dominant radionuclide in the coolant of pressurized water reactors during normal operation. It is produced from 16O (in water) via (n,p) reaction. It has a short half-life of about 7.1 s, but during its decay back to 16O produces high-energy gamma radiation (5 to 7 MeV). Because of this, the access to the primary coolant piping must be restricted during reactor power operation. 16N is one of the main means used to immediately detect even small leaks from the primary coolant to the secondary steam cycle." Source and further information: http://en.wikipedia.org/wiki/Nitrogen 2) Starting with the most common isotope 14N, you would obtain first the less common, but still stable isotope 15N. With further neutrons, you will get unstable isotopes of nitrogen. The bigger known is 25N (7 protons and 18 neutrons. Further information: http://en.wikipedia.org/wiki/Isotopes_of_nitrogen

you would get ANOTHER isotope. This is important, it won't become A isotope, but ANOTHER. Depending on which isotope you begin with, I assume it would become unstable, but I don't know about that for sure