Titanium (atomic symbol "Ti", atomic number = 22, atomic weight = 47.90) is a lightweight, strong white metal. (It is as strong as steel, but 45% lighter.) It is often alloyed with aluminum, manganese and iron, among others to produce strong lightweight alloys that can withstand extreme temperatures. These alloys are used to make airplanes, missiles and racing bikes. Titanium dioxide is extensively used as a pigment.