Oxidation refers to a change in electrons (In this case, loss of electrons). It has no impact on the number of neutrons, or for that matter on any sub-atomic particles in the nucleus. So the number of neutrons (3) remains the same
The number of protons in an atom is equal to the atomic number.
a. pressure increases
Gay Lussac's Law
When the volume constant, the gas pressure is proportional to its absolute temperature