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{{infobox rutherfordium}}
'''Rutherfordium''' is a [[synthetic element|synthetic chemical element]]; it has [[Chemical symbol|symbol]] '''Rf''' and [[atomic number]] 104. It is named after [[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]], <sup>267</sup>Rf, 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 element]]s. It is in [[period 7]] and is a [[group 4 element]]. Chemistry experiments have confirmed that rutherfordium behaves as the heavier [[Homologous series|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 quantum chemistry|relativistic effects]].
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