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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 - Ti. Chemical properties of titanium - Health effects of titanium - Environmental effects of titanium. Titanium. Chemical element, Ti, atomic number 22 and atomic weight 47.90. Its chemical behaviour shows many similarities with that or silica and zirconium, as an element belonging to the first transition group.