What Is Rutherfordium?
Rutherfordium is a chemical element with the symbol Rf and atomic number 104, found within the transition metal block of the periodic table.
Named after Ernest Rutherford. The first transactinide element.
As a transition metal in Period 7 and Group 4 (Transition Metals), rutherfordium's placement on the table reflects its electron configuration of [Rn] 5f¹⁴ 6d² 7s², which governs its bonding behavior and the type of compounds it typically forms.
Position on the Periodic Table
Rutherfordium is located in Period 7, the bottom row of the standard periodic table, consisting largely of radioactive and synthetic elements.
Within that row, rutherfordium sits in Group 4 (Transition Metals), alongside elements that share a similar number of valence electrons and, by extension, similar chemical behavior.
This position is not arbitrary — the periodic table was deliberately organized so that an element's row and column reveal its expected reactivity, bonding pattern, and physical state at a glance.
Physical & Chemical Properties
Rutherfordium has an atomic mass of (267) u and a density of ~23 g/cm³. Its melting point is 2400°C and its boiling point is 5800°C.
As a transition metal, rutherfordium conducts electricity and heat well, and its atoms pack into a metallic crystal lattice held together by shared, delocalized electrons.
Electron Configuration Explained
Rutherfordium's electron configuration is [Rn] 5f¹⁴ 6d² 7s², describing how its electrons are distributed across shells and subshells around the nucleus.
Reading the configuration in order shows electrons filling shells of increasing energy, following the standard Aufbau principle that explains how atomic structure builds up across the periodic table.
The outermost (valence) electrons shown in this configuration are what ultimately determine rutherfordium's chemical reactivity and the type of bonds it forms with other elements.
History & Discovery
Rutherfordium was formally discovered in 1969, Ghiorso/Flerov, identified through the careful isolation and analytical techniques typical of that era's chemical research.
Many elements from this period were anticipated by Dmitri Mendeleev's periodic table, which successfully predicted gaps corresponding to undiscovered elements well before laboratory instruments existed to confirm them directly.
What Is Rutherfordium Used For?
Rutherfordium's specific properties make it useful in several applications, including:
- Research only
- Nuclear physics
- Scientific study
- No practical uses
- Academic research
These uses reflect rutherfordium's underlying classification as a transition metal, since the same properties that define its category in chemistry also determine where it becomes practically useful.
Fun Facts About Rutherfordium
- Rutherfordium was named after Ernest Rutherford, who discovered the atomic nucleus in 1911.
- Rutherfordium is element number 104 on the periodic table, in Period 7 and Group 4.
- Its standard atomic mass is (267) u, calculated from the natural abundance of its isotopes.
Frequently Asked Questions
What is Rutherfordium's atomic number?
Rutherfordium has atomic number 104.
What is Rutherfordium's chemical symbol?
Rutherfordium's symbol is Rf.
What group and period is Rutherfordium in?
Rutherfordium is in Period 7, Group 4 (Transition Metals).
What is Rutherfordium's atomic mass?
Rutherfordium's standard atomic mass is (267) u.