The statement is False. The atomic number of an element is defined as the number of protons found in the nucleus of an atom of that element. For titanium (Ti), the atomic number is 22, meaning that every titanium atom, regardless of its isotope (like Ti-48), has 22 protons in its nucleus.
Ti-48 refers to a specific isotope of titanium that has a total of 48 nucleons (the sum of protons and neutrons). In the case of Ti-48, it has 22 protons and 26 neutrons. This is where the confusion might arise; however, the atomic number remains at 22, not 26.