Recent work is more reliable regarding the identification of the parent rutherfordium radioisotopes. All data from rutherfordium onwards is predicted. There was debate between Russia and America over who first discovered of Rutherfordium. The chemical properties of rutherfordium are characterized only partly. The chemical element rutherfordium (element 104) was named after him in 1997. In 1997 the teams involved resolved the dispute and adopted the current name "rutherfordium". It contains the elements titanium (Ti), zirconium (Zr), hafnium (Hf) and rutherfordium (Rf). Element 104 is now known as rutherfordium. Rutherfordium (Rf) is a synthetic element and thus has no stable isotopes. Heavier isotopes of rutherfordium have only been observed as decay products. Rutherfordium has no stable or naturally occurring isotopes. In 1997 a committee of IUPAC recommended that element 104 be named rutherfordium. Thus, for the larger rutherfordium ion, the complexes , and are possible.