No, it is not possible to convert one type of atom to another type of atom without changing its atomic number. The atomic number of an atom is determined by the number of protons in its nucleus. Changing the atomic number would mean changing the number of protons, which would result in a completely different element.
However, it is possible to convert one isotope of an element to another isotope of the same element while keeping the atomic number unchanged. Isotopes of an element have the same number of protons (same atomic number) but different numbers of neutrons (different mass numbers). This can occur through processes such as radioactive decay or nuclear reactions.
In radioactive decay, an unstable isotope undergoes a spontaneous transformation into a more stable isotope by emitting particles or radiation. During this process, the mass number of the atom may remain the same, but the atomic number changes, resulting in the formation of a different element.
Nuclear reactions, such as nuclear fission and fusion, can also change the isotopic composition of an element without altering the atomic number. These reactions involve the interaction of atomic nuclei, and they can result in the creation of different isotopes of the same element or even different elements altogether. However, these processes generally require high-energy conditions and are not feasible under normal circumstances.
So, while it is possible to change the isotope of an element without altering the atomic number, it is not possible to convert one type of atom to another type while keeping the same atomic number.