Element identity / decay
Nuclear production and decay establish element 104.
Atom-scale chemistry
Rapid experiments support Group 4-like +4 chemistry.
Electronic structure
Reference configuration is theory/evaluation-led.
Bulk phase / density / crystal
No macroscopic bulk properties are asserted.
Research boundary
No operational synthesis parameters are provided.
The lens describes evidence status, not confidence theatre. “Unknown” is kept unknown, and teaching schematics are not presented as direct measurements.
Rutherfordium (Rf)
Rutherfordium is element 104, a synthetic superheavy member of Group 4. Nuclear decay establishes its identity, while atom-scale chemistry supports important similarities to zirconium and hafnium—without providing a measured bulk density, melting point or crystal lattice.
Rutherfordium atomic number, mass, electron configuration and key properties
Rutherfordium: quick answers
How many protons, neutrons and electrons does rutherfordium have?
Rutherfordium’s atomic number is 104, so every rutherfordium atom has 104 protons, and a neutral atom also has 104 electrons. Rutherfordium has no stable isotopes, so the neutron count depends on the isotope: rutherfordium-267, featured on this page, has 163 neutrons.
What is the symbol for rutherfordium?
The chemical symbol for rutherfordium is Rf.
Is rutherfordium a solid, liquid or gas at room temperature?
Rutherfordium has only been made a few atoms at a time, so its state at room temperature is unknown.
What family (group) is rutherfordium in?
Rutherfordium is a transition metal (predicted), in group 4, period 7 of the periodic table.
What is the electron configuration of rutherfordium?
The ground-state electron configuration of rutherfordium is [Rn] 5f¹⁴ 6d² 7s². This is a predicted configuration; it has not been measured.
From atomic number to chemistry
Read these as a chain of causes, not as isolated facts. Each step links to the concept hub if you want the underlying idea explained.
104 protons define rutherfordium.
The reference ground-state configuration frames atomic and chemical behavior.
Periodic position organizes recurring trends without replacing element-specific evidence.
The teaching nucleus is one isotope, not the relative atomic mass.
Phase claims preserve measured/evaluated/predicted/unknown evidence labels.
Rutherfordium in its period and family
Rutherfordium is placed below hafnium in Group 4. Relativistic quantum chemistry modifies details, but experiments support important Group 4 behavior at the atom/solution-chemistry scale.
Rutherfordium Visual Lab
Rotate a ²⁶⁷Rf teaching nucleus and representative 6d/7s probability clouds, then use the Evidence Lens to separate measured decay/atom-scale +4 chemistry from unknown bulk material properties.
Every mark points to one exact feature
The numbered markers explain the same information system used throughout Element Lookup. Unknown or predicted fields remain visibly labelled rather than being replaced with guesses.
Rutherfordium in one minute
Atomic number 104 means 104 protons.
Rutherfordium is synthetic and all known isotopes are radioactive.
Atom-scale chemical experiments support Group 4-like +4 chemistry.
Bulk density, melting point, boiling point and crystal structure are unknown.
Discovery credit and naming involved long-running Dubna/Berkeley history; IUPAC adopted Rutherfordium.
Shell rings organize electron counts. They are not electron trajectories or orbital shapes.
2 · 8 · 18 · 32 · 32 · 10 · 2 electrons
The 6d/7s clouds are representative isolated-atom teaching forms. Superheavy electronic structure is strongly relativistic; these visuals are not measured bulk orbitals.
Rutherfordium has been studied atom-at-a-time. No macroscopic lattice is experimentally established, so the material viewer remains an evidence panel rather than extrapolating zirconium/hafnium structures.. The viewer is evidence-aware: measured structures are identified as such; unknown bulk structures stay unknown.
Teaching visualization; not a literal finite sample or thermal trajectory.What this model does—and does not—show
The 6d/7s clouds are representative isolated-atom teaching forms. Superheavy electronic structure is strongly relativistic; these visuals are not measured bulk orbitals.
Where do I meet rutherfordium?
Clickable learning cards connect the element to materials, environment, technology, biology or research - depending on what the evidence actually supports.
Nuclear identity
Rutherfordium isotopes are identified through nuclear-production and decay measurements.
Measured decay → atom-scale +4 chemistry → unknown bulk
Rutherfordium has experimentally meaningful chemistry without ever becoming a macroscopic material sample.
Nuclear identity
Production and decay chains establish element 104 isotopes.
Titanium and rutherfordium: measured bulk vs atom-scale chemistry
Group placement remains useful, but the evidence type changes radically at element 104.
| Evidence | bulk measured |
|---|---|
| Common state | +4 |
| Evidence | atom-scale chemistry |
|---|---|
| Supported state | +4 |
Rutherfordium properties: atomic, physical, thermal and chemical
Categories follow the science of this element rather than a fixed decorative template. Each row carries condition/provenance context and an evidence label; unknown values stay unknown.
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Atomic number | 104 | Source-reviewed; see Sources below | Evaluated |
| Relative atomic mass | [267] | Source-reviewed; see Sources below | Evaluated |
| ²⁶⁷Rf | Radioactive superheavy isotope | Reference teaching nucleus with 104 protons and 163 neutrons. | Evaluated |
| ²⁶¹Rf | Radioactive isotope | Used in some chemical/nuclear studies. | Evaluated |
| Rutherfordium isotope context | No stable isotopes | All known isotopes are radioactive and synthetic. | Evaluated |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Ground-state electron configuration | [Rn] 5f¹⁴ 6d² 7s² | Source-reviewed; see Sources below | Predicted |
| Group / period / block | Group 4 · Period 7 · d-block | Periodic-table placement | Evaluated |
| Electronegativity | Unknown | Source-reviewed; see Sources below | Unknown |
| Common oxidation states | +4 experimentally supported in atom-scale chemistry; other states theory-dependent | Source-reviewed; see Sources below | Predicted |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| ²⁶⁷Rf | Radioactive superheavy isotope | Reference teaching nucleus with 104 protons and 163 neutrons. | Evaluated |
| ²⁶¹Rf | Radioactive isotope | Used in some chemical/nuclear studies. | Evaluated |
| Rutherfordium isotope context | No stable isotopes | All known isotopes are radioactive and synthetic. | Evaluated |
| Teaching nucleus | ²⁶⁷Rf · 104 protons + 163 neutrons | Reference isotope used in the nucleus model | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Current use | Scientific research only | No commercial bulk use is implied. | Reviewed |
| Geography | Discovery, naming and research context only | No natural-resource map is appropriate. | Reviewed |
| Safety boundary | Non-operational educational context | No synthesis settings or material-access guidance. | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Density | Unknown | Source-reviewed; see Sources below | Unknown |
| Material / molecular structure | No measured macroscopic crystal structure | Rutherfordium has been studied atom-at-a-time. No macroscopic lattice is experimentally established, so the material viewer remains an evidence panel rather than extrapolating zirconium/hafnium structures. | Predicted |
| Melting / transition reference | Unknown | Source-reviewed; see Sources below | Unknown |
| Boiling / gas reference | Unknown | Source-reviewed; see Sources below | Unknown |
| Common oxidation states | +4 experimentally supported in atom-scale chemistry; other states theory-dependent | Source-reviewed; see Sources below | Predicted |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Page evidence note | Element identity and decay are experimental. Atom-scale chemistry supports Group 4 +4 behavior. Bulk density, phase boundaries and crystal structure remain unknown; no lighter-element lattice is copied into the viewer. | Evidence summary for this guide | Reviewed |
| Structure evidence | Rutherfordium has been studied atom-at-a-time. No macroscopic lattice is experimentally established, so the material viewer remains an evidence panel rather than extrapolating zirconium/hafnium structures. | Measured structure, labelled schematic, prediction or explicit unknown as applicable. | Reviewed |
| Map evidence rule | Real pins are reviewed examples; conceptual layers are used when pins would mislead. | Geography Explorer 2.0 | Reviewed |
| Source set | 2 primary/reference links listed below | Open the Sources section for the actual references. | Reviewed |
Is Rutherfordium a solid, liquid or gas? State at temperature
No measured macroscopic phase boundaries exist for rutherfordium. The temperature explorer remains in an explicitly unknown state rather than inventing solid/liquid/gas transitions.
Where on Earth is Rutherfordium found or produced?
Who discovered Rutherfordium, and when?
Dubna and Berkeley teams reported production of element 104 isotopes in separate experiments.
Discovery priority and naming were debated internationally.
IUPAC adopted the name rutherfordium (Rf) as part of the final naming resolution for elements 101–109.
Atom-scale chemical studies support Group 4-like behavior.
How rutherfordium knowledge is built: atom-at-a-time evidence
Accelerator research produces extremely small numbers of superheavy atoms; operational synthesis parameters are outside this guide.
Decay chains establish isotope identity and nuclear properties.
Rapid chemical experiments can test adsorption/solution behavior before atoms decay.
Theory and periodic comparison interpret sparse measurements, while bulk properties remain explicitly unknown.
What is rutherfordium used for?
Fundamental nuclear research
Rutherfordium extends understanding of superheavy nuclei and decay.
Atom-scale chemistry
Experiments test Group 4 behavior under relativistic conditions.
Periodic-table science
Comparison with Ti/Zr/Hf probes how periodic trends survive at very high nuclear charge.
No practical bulk use
Only research-scale atom counts exist.
Rutherfordium isotopes and natural abundance
²⁶⁷Rf
Radioactive superheavy isotopeReference teaching nucleus with 104 protons and 163 neutrons.
²⁶¹Rf
Radioactive isotopeUsed in some chemical/nuclear studies.
Rutherfordium isotope context
No stable isotopesAll known isotopes are radioactive and synthetic.
Five-question Rutherfordium check
What is rutherfordium’s atomic number?
What chemistry has experimental support?
What is the measured melting point?
What does the material viewer show?
What is its practical use?
Rutherfordium questions students commonly ask
Each answer starts with the direct fact, then explains the chemistry, evidence or material context so the result is understandable rather than merely memorized.
What is rutherfordium?
Short answer: Rutherfordium is synthetic element 104, placed in Group 4.
Atomic number 104 means every rutherfordium nucleus contains 104 protons. In the periodic table, Rutherfordium is classified here as a synthetic superheavy group 4 element in Period 7 and Group 4. Rutherfordium is placed below hafnium in Group 4. Relativistic quantum chemistry modifies details, but experiments support important Group 4 behavior at the atom/solution-chemistry scale.
Key point: Rf is element 104; its periodic position and electron structure explain the rest of the page.
Who discovered rutherfordium?
Short answer: Discovery history involves both Dubna and Berkeley experiments; priority was historically disputed.
In 1960s, dubna and Berkeley teams reported production of element 104 isotopes in separate experiments. In 1970s–1990s, discovery priority and naming were debated internationally.
Key point: Discovery credit follows the historical evidence and accepted attribution, not just the earliest claim.
What is rutherfordium used for?
Short answer: Fundamental nuclear and atom-scale chemical research only.
Fundamental nuclear research: Rutherfordium extends understanding of superheavy nuclei and decay. Atom-scale chemistry: Experiments test Group 4 behavior under relativistic conditions. Rutherfordium demonstrates the difference between “we know its chemistry resembles Group 4” and “we have a chunk of the material.” The first has experimental support; the second does not exist.
Key point: Always distinguish the pure element from the compound, alloy, isotope or device material that actually performs the application.
Is rutherfordium a metal?
Short answer: It is classified as a Group 4 transition element and its chemistry supports metal-like Group 4 behavior, but no macroscopic metal sample has been measured.
This guide classifies Rutherfordium as a synthetic superheavy group 4 element. Its periodic position is Period 7, d-block, Group 4. Rutherfordium is placed below hafnium in Group 4. Relativistic quantum chemistry modifies details, but experiments support important Group 4 behavior at the atom/solution-chemistry scale.
Key point: Periodic-table classification describes recurring atomic/chemical behavior; it does not make every element in a column physically identical.
What is rutherfordium’s state of matter?
Short answer: Macroscopic bulk state is not experimentally established.
No measured macroscopic phase boundaries exist for rutherfordium. The temperature explorer remains in an explicitly unknown state rather than inventing solid/liquid/gas transitions. Rutherfordium has been studied atom-at-a-time. No macroscopic lattice is experimentally established, so the material viewer remains an evidence panel rather than extrapolating zirconium/hafnium structures.
Key point: Phase statements need temperature, pressure and evidence context.
What is rutherfordium’s electron configuration?
Short answer: Reference configuration [Rn] 5f¹⁴ 6d² 7s².
The neutral-atom ground-state reference used on this page is [Rn] 5f¹⁴ 6d² 7s². This is an isolated-atom reference: bonding and ion formation can change which outer electrons are present or chemically active. The listed common oxidation-state context is +4 experimentally supported in atom-scale chemistry; other states theory-dependent, which helps connect the atomic configuration to ordinary chemistry without treating electron counting as a single universal rule.
Key point: Electron configuration is a ground-state atomic reference, not a literal picture of every compound.
Scientific sources for Rutherfordium
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