Logo of the Atomic Weights Commission Logo of the International Union of Pure and Applied Chemistry


    IsotopeAtomic mass (Da)Isotopic abundance (amount fraction)
    46Ti 45.952 628(3)0.0825(3)
    47Ti 46.951 759(3)0.0744(2)
    48Ti 47.947 942(3)0.7372(3)
    49Ti 48.947 866(3)0.0541(2)
    50Ti 49.944 787(3)0.0518(2)

    Titanium is an abundant, widely distributed element, yet until 1993, it was the element with the most uncertain atomic weight with U[Ar(Ti)]/Ar(Ti) = 626 parts per million. This situation changed in 1993 when the Commission acknowledged recent mass spectrometric measurements and recommended Ar(Ti) = 47.867(1).

    SOURCE  Atomic weights of the elements: Review 2000 by John R de Laeter et al. Pure Appl. Chem. 2003 (75) 683-800
    © IUPAC 2003


    Ar(Ti) = 47.867(1) since 1993

    The name derives from the Latin titans, who were the mythological "first sons of the earth". It was originally discovered by the English clergyman William Gregor in the mineral ilmenite (FeTiO3) in 1791. He called this mineral menachanite and the element menachin, for the Menachan parish where it was found. It was rediscovered in 1795 by the German chemist Martin Heinrich Klaproth, who called it titanium because it had no characteristic properties to use as a name. Titanium metal was first isolated by the Swedish chemists Sven Otto Pettersson and Lars Fredrik Nilson.