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What (who) is rutherfordium$520930$ - definition
![Element 104 was eventually named after [[Ernest Rutherford]]](https://commons.wikimedia.org/wiki/Special:FilePath/Ernest Rutherford2.jpg?width=200 "Element 104 was eventually named after [[Ernest Rutherford]]")
![Energy eigenvalues for the 1s, 2s, 2p<sub>1/2</sub> and 2p<sub>3/2</sub> shells from solutions of the [[Dirac equation]] (taking into account the finite size of the nucleus) for ''Z'' = 135–175 (–·–), for the Thomas-Fermi potential (—) and for ''Z'' = 160–170 with the self-consistent potential (---).<ref name=Fricke/>](https://commons.wikimedia.org/wiki/Special:FilePath/1s negative continuum.svg?width=200 "Energy eigenvalues for the 1s, 2s, 2p<sub>1/2</sub> and 2p<sub>3/2</sub> shells from solutions of the [[Dirac equation]] (taking into account the finite size of the nucleus) for ''Z'' = 135–175 (–·–), for the Thomas-Fermi potential (—) and for ''Z'' = 160–170 with the self-consistent potential (---).<ref name=Fricke/>")
Wikipedia
Rutherfordium is a chemical element with the symbol Rf and atomic number 104, named after New Zealand-born British physicist Ernest Rutherford. As a synthetic element, it is not found in nature and can only be made in a particle accelerator. It is radioactive; the most stable known isotope, 267Rf, has a half-life of about 48 minutes.
In the periodic table, it is a d-block element and the second of the fourth-row transition elements. It is in period 7 and is a group 4 element. Chemistry experiments have confirmed that rutherfordium behaves as the heavier homolog to hafnium in group 4. The chemical properties of rutherfordium are characterized only partly. They compare well with the other group 4 elements, even though some calculations had indicated that the element might show significantly different properties due to relativistic effects.
In the 1960s, small amounts of rutherfordium were produced at Joint Institute for Nuclear Research in the Soviet Union and at Lawrence Berkeley National Laboratory in California. Priority of discovery and hence the name of the element was disputed between Soviet and American scientists, and it was not until 1997 that the International Union of Pure and Applied Chemistry (IUPAC) established rutherfordium as the official name of the element.
