Titanium (Ti) is a metallic chemical element with atomic number 22. It is a very strong metal despite being relatively lightweight. It is also highly resistant to corrosion. These properties make alloys containing titanium suitable for use in various types of vehicles ranging from ships to aircrafts and spacecrafts.

The are various stable titanium isotopes, but the most common one is ⁴⁸Ti, with 22 protons and 26 neutrons.