If all the protons in an atom were to become neutrons, the resulting atom would no longer have any protons. Since the atomic number of an element is defined by the number of protons it possesses, this hypothetical atom would have an atomic number of 0.
Elements with an atomic number of 0 do not exist in the periodic table, as they would not have any protons to define their chemical properties. Therefore, it would not have a specific name within the known elements.