![Rutherfordium element card: symbol Rf, atomic number 104, atomic mass [267], electron configuration [Rn] 5f¹⁴ 6d² 7s², oxidation states +4, Transition metal, group 4, period 7.](https://stage.chemistry-dictionary.com/wp-content/uploads/2026/09/rutherfordium-chemical-element.webp)
Scientists create this heavy transition metal in a laboratory through a process called nuclear fusion. They shoot high-energy beams of light atoms at heavy target atoms to fuse their nuclei. Rutherfordium sits in group 4 of the periodic table, directly below zirconium and hafnium.
This location means Rutherfordium starts the d-block section of the seventh row of elements. Chemical tests show Rutherfordium behaves like hafnium and prefers a plus four oxidation state. An oxidation state shows how many electrons an atom loses or shares in reactions.
However, special relativistic physics effects can alter how its outer electrons behave. These effects happen because the electrons move close to the speed of light. Relativistic effects cause the element to show slight deviations from normal periodic trends.
A common student misconception is that we can gather enough rutherfordium to see it. In reality, scientists can only make and study a single atom at a time. This element has an extremely short half-life, so it decays in a few seconds.
A half-life is the time it takes for half of a radioactive sample to break down. Since it decays so fast, the heat from the decay would vaporize any large sample instantly.