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Group 4 is a group of elements in the periodic table. It contains the elements titanium (Ti), zirconium (Zr), hafnium (Hf) and rutherfordium (Rf). This group lies in the d-block of the periodic table. The group itself has not acquired a trivial name; it belongs to the broader grouping of the transition metals.
Titanium metal is always bonded to other elements in nature. It is the ninth-most abundant element in the Earth's crust (0.63% by mass) and is present in most igneous rocks and in sediments derived from them (as well as in living things and natural bodies of water).