Naturally occurring titanium (22Ti) is composed of five stable isotopes; Ti, Ti, Ti, Ti and Ti with Ti being the most abundant (73.8% natural abundance). Twenty-three radioisotopes have been characterized, with the most stable being Ti with a half-life of 59.1 years and Ti with a half-life of 184.8 minutes. All of the remaining radioactive isotopes have half-lives that are less than 10 minutes, and the majority of these have half-lives that are less than one second.
The isotopes of titanium range from Ti to Ti. The primary decay mode for isotopes lighter than the stable isotopes is β and the primary mode for the heavier ones is β; the decay products are respectively scandium isotopes and vanadium isotopes.