Elven gymyk synthetek yw rutherfordiom, niver 104 y'n Vosen Beriodek. Y furvell gymyk yw Rf. An hanow a enor an fysegydh a Vordir Nowydh, Ernest Rutherford (1871-1937), tas fysegieth modern, neb a dhiskudhas tybyans hanter-bewnans radyoweythresek ha'n elven radon, ha henwel dewynnyans α ha β. Ev a gavas an Pewas Nobel rag fysegieth yn 1908. Gwrys veu rutherfordiom rag an kynsa prys yn 1964 yn Fondyans Hwithrans Nuklerek yn Dubna, Russi. I a brofyas an hanow kurchatoviom, owth enora Igor Kurchatov (1903-1960), penn hwithrans nuklerek Russi. Godhonydhyon a'n Statys Unys a naghas dhe'n hanow ma, ow leverel i bos diskudhoryon an elven yn 1969, yn Pennskol Kaliforni, Berkeley. I a brofyas an hanow rutherfordiom. An Kesunyans Keswlasek rag Kymygieth Pur ha Gweythresek (IUPAC) a erviras dhe rutherfordiom yn 1997. Pur radyoweythresek yw pub isotop, hanter-bewnans rutherfordiom-267 yw an hirra, a-dro dhe 80 mynysen.
Rutherfordium is a synthetic 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 created in a laboratory. It is radioactive; the most stable known isotope, 267Rf, has a half-life of approximately 1.3 hours. In the periodic table of the elements, it is a d-block element and the second of the fourth-row transition elements. It is a member of the 7th period and belongs to the group 4 elements. Chemistry experiments have confirmed that rutherfordium behaves as the heavier homologue to hafnium in group 4. The chemical properties of rutherfordium are characterized only partly. They compare well with the chemistry of the other group 4 elements, even though some calculations had indicated that the element might show significantly different properties due to relativistic effects.langbot langbot