Element / isotope identity
Atomic number, isotope identity and discovery evidence are experimentally/evaluatively grounded.
Electron configuration
Very-heavy-element configurations are theory/evaluation-led; ordinary elements use evaluated ground-state references.
Bulk material structure
No macroscopic crystal lattice is asserted.
Phase / density data
Unknown values stay unknown; reported values are tied to the elemental material reference.
The lens describes evidence status, not confidence theatre. “Unknown” is kept unknown, and teaching schematics are not presented as direct measurements.
Lawrencium (Lr)
Lawrencium is element 103. This guide connects its periodic-table identity to evidence-aware structure, isotopes, uses, discovery and the search questions learners actually ask.
Lawrencium atomic number, mass, electron configuration and key properties
Lawrencium: quick answers
How many protons, neutrons and electrons does lawrencium have?
Lawrencium’s atomic number is 103, so every lawrencium atom has 103 protons, and a neutral atom also has 103 electrons. Lawrencium has no stable isotopes, so the neutron count depends on the isotope: lawrencium-262, featured on this page, has 159 neutrons.
What is the symbol for lawrencium?
The chemical symbol for lawrencium is Lr.
Is lawrencium a solid, liquid or gas at room temperature?
Lawrencium has only ever been made in tiny amounts, so its state at room temperature has not been observed; it is expected to be a solid metal.
What family (group) is lawrencium in?
Lawrencium is an actinide, in group 3, period 7 of the periodic table.
What is the electron configuration of lawrencium?
The ground-state electron configuration of lawrencium is [Rn] 5f¹⁴ 7s² 7p¹.
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.
103 protons define lawrencium.
Ground-state/reference configuration frames atomic behavior; heavy-element predictions remain evidence-labelled.
Periodic position organizes trends without replacing element-specific evidence.
The teaching nucleus is one isotope, not the relative atomic mass.
Measured structures are visualized; unknown bulk structures stay unknown.
Lawrencium in its period and family
Lawrencium is element 103 in Period 7. Its f-block/series position provides useful periodic context, but element-specific experimental evidence takes priority over simple trend extrapolation.
Lawrencium Visual Lab
Explore Lr across the teaching nucleus, isolated-atom orbitals, evidence-aware material structure and temperature/evidence views, then connect those models to uses, isotopes, search-led questions and source-backed context.
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.
Lawrencium in one minute
Atomic number 103 means every lawrencium nucleus has 103 protons.
The ground-state/reference electron configuration is [Rn] 5f¹⁴ 7s² 7p¹.
The representative teaching isotope is ²⁶²Lr.
Lawrencium closes the actinide sequence and has an unusual 7p¹ ground-state reference. Its atomic electronic structure is better constrained than its inaccessible bulk material properties.
Material structure status: Bulk crystal structure not experimentally established.
Shell rings organize electron counts. They are not electron trajectories or orbital shapes.
2 · 8 · 18 · 32 · 32 · 8 · 3 electrons
Displayed orbitals are isolated-atom, nonrelativistic teaching probability models. They are not bulk-band structures, bonding orbitals or direct measured electron-density maps; relativistic effects become especially important for very heavy elements.
No defensible macroscopic crystal lattice is displayed for Lawrencium. Nuclear/atomic evidence and theory are kept separate from unmeasured bulk material properties.. 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
Displayed orbitals are isolated-atom, nonrelativistic teaching probability models. They are not bulk-band structures, bonding orbitals or direct measured electron-density maps; relativistic effects become especially important for very heavy elements.
Where do I meet lawrencium?
Clickable learning cards connect the element to materials, environment, technology, biology or research - depending on what the evidence actually supports.
Scientific research only
This context uses Lawrencium or a lawrencium-containing material; the element and its compounds/isotopes are kept distinct.
Evidence ladder: nucleus → atom-scale chemistry → unknown bulk material
For scarce synthetic heavy elements, different claims have very different evidence strength.
Nuclear identity
Production/decay evidence establishes the element and specific isotopes.
Lawrencium in periodic context
Compare nearby or family-related elements without treating a periodic trend as a substitute for element-specific evidence.
| Atomic number | 102 |
|---|---|
| Context | neighbor / series |
| Atomic number | 103 |
|---|---|
| Context | neighbor / series |
| Atomic number | 104 |
|---|---|
| Context | neighbor / series |
Lawrencium 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 | 103 | Source-reviewed; see Sources below | Evaluated |
| Relative atomic mass | [262] | Source-reviewed; see Sources below | Evaluated |
| Ground-state electron configuration | [Rn] 5f¹⁴ 7s² 7p¹ | Source-reviewed; see Sources below | Evaluated |
| Group / period / block | Group Actinide / Group 3 context · Period 7 · f-block | Periodic-table placement | Evaluated |
| Electronegativity | Unknown | Source-reviewed; see Sources below | Unknown |
| Reference isotope | ²⁶²Lr | Source-reviewed; see Sources below | Evaluated |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| State context | Radioactive synthetic actinide produced atom by atom | Source-reviewed; see Sources below | Evaluated |
| Density | Unknown | Source-reviewed; see Sources below | Unknown |
| Material / molecular structure | Bulk crystal structure not experimentally established | No defensible macroscopic crystal lattice is displayed for Lawrencium. Nuclear/atomic evidence and theory are kept separate from unmeasured bulk material properties. | Unknown |
| Classification | Actinide | Periodic-table / chemistry classification | Evaluated |
| Structure-model scope | No defensible macroscopic crystal lattice is displayed for Lawrencium. Nuclear/atomic evidence and theory are kept separate from unmeasured bulk material properties. | Teaching visualization; exact crystallographic coordinates are not implied unless stated. | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Melting / transition reference | 1900 K (reported reference) | Source-reviewed; see Sources below | Evaluated |
| Boiling / gas reference | Unknown | Source-reviewed; see Sources below | Unknown |
| Phase-path context | A melting reference of 1900 K (reported reference) is reported for teaching context, while an ordinary boiling point is not established here. The page does not infer a precise gas transition from theory. | Shared phase registry drives the slider, regions and markers. | Evaluated |
| Condition warning | Temperature and pressure define phase behavior; purity/allotropy may matter. | Teaching condition statement | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Common oxidation states | +3 | Source-reviewed; see Sources below | Evaluated |
| Ion / common ion context | Lr³⁺ | Source-reviewed; see Sources below | Evaluated |
| Periodic chemistry context | Lawrencium is element 103 in Period 7. Its f-block/series position provides useful periodic context, but element-specific experimental evidence takes priority over simple trend extrapolation. | Element-specific interpretation | Reviewed |
| Chemistry caution | Elemental form, ions and compounds are distinct chemical objects. | Interpretive teaching rule | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| ²⁶²Lr | Reference teaching isotope | Mass number belongs to a specific isotope and is not the same thing as relative atomic mass. | Evaluated |
| Isotope evidence | Element-specific nuclear context | Half-life and decay properties are isotope-specific; the page does not generalize one isotope to all atoms. | Evaluated |
| Teaching nucleus | ²⁶²Lr · 103 protons + 159 neutrons | Reference isotope used in the nucleus model | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Page evidence note | Atomic identity and source-reviewed reference values are separated from predictions. Search demand shapes headings and FAQs but never overrides scientific evidence; unknown bulk structure/density/phase values remain visibly unknown. | Evidence summary for this guide | Reviewed |
| Structure evidence | No defensible macroscopic crystal lattice is displayed for Lawrencium. Nuclear/atomic evidence and theory are kept separate from unmeasured bulk material properties. | 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 | 3 primary/reference links listed below | Open the Sources section for the actual references. | Reviewed |
Is Lawrencium a solid, liquid or gas? State at temperature
A melting reference of 1900 K (reported reference) is reported for teaching context, while an ordinary boiling point is not established here. The page does not infer a precise gas transition from theory.
Where on Earth is Lawrencium found or produced?
Who discovered Lawrencium, and when?
Berkeley and Dubna teams made competing discovery claims; lawrencium is named for cyclotron inventor Ernest Lawrence.
The element name and discovery story are part of the historical record; search-led questions are answered without turning history into scientific evidence for bulk properties.
Current use is described at the level supported by the element’s availability and evidence, with research-only elements kept research-only.
Research production context: high-level, non-operational
The element is produced or isolated only in specialized research/nuclear settings; this page intentionally omits operational synthesis, target, beam, separation, handling and access instructions.
Experimental identity is established from nuclear decay, spectroscopy and/or atom-scale chemistry appropriate to the element.
Any chemical or material inference is labelled by evidence strength; unmeasured bulk properties are not converted into visual facts.
Research use is described conceptually, with isotope-specific claims kept distinct from the element as a whole.
What is lawrencium used for?
Scientific research only
Research-only context; no operational production or handling guidance.
Atomic and actinide chemistry studies
Research-only context; no operational production or handling guidance.
Lawrencium isotopes and natural abundance
²⁶²Lr
Reference teaching isotopeMass number belongs to a specific isotope and is not the same thing as relative atomic mass.
Isotope evidence
Element-specific nuclear contextHalf-life and decay properties are isotope-specific; the page does not generalize one isotope to all atoms.
Five-question Lawrencium check
What is Lawrencium’s atomic number?
Which statement best describes the material evidence for Lawrencium?
What is the safest rule for Lawrencium uses?
Lawrencium 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 lawrencium?
Short answer: Lawrencium is chemical element 103, symbol Lr, classified here as actinide.
Atomic number 103 means every lawrencium nucleus contains 103 protons. In the periodic table, Lawrencium is classified here as an actinide in Period 7 and Group Actinide / Group 3 context. Lawrencium is element 103 in Period 7. Its f-block/series position provides useful periodic context, but element-specific experimental evidence takes priority over simple trend extrapolation.
Key point: Lr is element 103; its periodic position and electron structure explain the rest of the page.
What is the atomic number of lawrencium?
Short answer: The atomic number is 103, meaning every lawrencium nucleus has 103 protons.
Atomic number is defined by proton count, so 103 protons are what make an atom lawrencium. A neutral lawrencium atom also has 103 electrons, while isotopes can have different neutron counts without changing the element.
Key point: Atomic number = proton count.
What is the symbol for lawrencium?
Short answer: The chemical symbol is Lr.
The symbol Lr is the standardized chemical abbreviation for element 103. In a chemical formula, Lr identifies lawrencium atoms; a compound containing Lr is not automatically the same material as elemental lawrencium.
Key point: Lr always identifies element 103.
What is the electron configuration of lawrencium?
Short answer: The modern ground-state reference used here is [Rn] 5f¹⁴ 7s² 7p¹, reflecting the unusual low-lying 7p orbital.
The neutral-atom ground-state reference used on this page is [Rn] 5f¹⁴ 7s² 7p¹. 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 +3, 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.
What is lawrencium used for?
Short answer: Lawrencium has no practical use outside scientific research.
Scientific research only: Research-only context; no operational production or handling guidance. Atomic and actinide chemistry studies: Research-only context; no operational production or handling guidance. Lawrencium closes the actinide sequence and has an unusual 7p¹ ground-state reference. Its atomic electronic structure is better constrained than its inaccessible bulk material properties.
Key point: Always distinguish the pure element from the compound, alloy, isotope or device material that actually performs the application.
Is lawrencium a metal?
Short answer: It is classified with the actinides and expected to be metallic, but no ordinary macroscopic sample is available for a measured bulk-lattice display.
This guide classifies Lawrencium as an actinide. Its periodic position is Period 7, f-block, Group Actinide / Group 3 context. Lawrencium is element 103 in Period 7. Its f-block/series position provides useful periodic context, but element-specific experimental evidence takes priority over simple trend extrapolation.
Key point: Periodic-table classification describes recurring atomic/chemical behavior; it does not make every element in a column physically identical.
What does lawrencium look like?
Short answer: No ordinary macroscopic sample has been measured well enough to justify a definitive bulk appearance or crystal-lattice claim on this page.
The ordinary elemental-material description used here is: Radioactive synthetic actinide produced atom by atom. No defensible macroscopic crystal lattice is displayed for Lawrencium. Nuclear/atomic evidence and theory are kept separate from unmeasured bulk material properties.
Key point: Elemental appearance can differ from the colors of its ions, compounds, oxide films or host materials.
Scientific sources for Lawrencium
- Royal Society of Chemistry - Lawrencium
- NIST - Atomic Weights and Isotopic Compositions
- IUPAC - Periodic Table of Elements
Questions to ask next about Lawrencium
A good element lesson should lead to the next useful question, not end after a list of facts.
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