Vanadium | chemical element | Britannica
>vanadium replaces iron. Ascidian blood also contains unusually large amounts of niobium, titanium, chromium, manganese, molybdenum, and tungsten.
titanium | Properties, Uses, & Facts | Britannica
Titanium: Titanium, chemical element, a silvery gray metal of Group 4 (IVb) of the periodic table. It is a lightweight, high-strength, low-corrosion structural metal .