cerium
Let an agent identify cerium and its properties, relay production, uses, isotopes and history from reference sources, relay safety information, and distinguish it from neighbouring lanthanides.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent identify cerium and its properties, relay production, uses, isotopes and history from reference sources, relay safety information, and distinguish it from neighbouring lanthanides.
A chemical element with symbol Ce and atomic number 58, a soft, ductile, silvery lanthanide and the most abundant rare earth element, which oxidises readily and shows both trivalent and tetravalent chemistry; cerium is used in catalytic converters, glass polishing, lighter flints and self-cleaning ovens, is recovered from monazite and bastnasite, and has four stable isotopes.
What it is for: Catalysts, glass polishing, alloys and pigments.
It can be relay properties and isotopes; explain production and uses; relay safety information; distinguish from other lanthanides.
Distinguishing features
Most abundant rare earth
Tetravalent chemistry
Pyrophoric alloys
Catalytic oxide
What it looks like
A soft, silvery metal that tarnishes quickly in air, with pale yellow oxide.
Physical character
atomic number: 58 Z
standard atomic weight: 140.116 u
melting point: 795 degrees C
density: 6.77 g/cm3
How it is recognised
Element 58, symbol Ce
Most abundant lanthanide, with a stable tetravalent state
Lanthanum and praseodymium are the neighbouring lanthanides
Related models
is a kind of - in registry terms
is a kind of - in registry terms
is used in - as ceria
is adjacent to - element 57
In practice
Families and kinds
cerium metal and mischmetal
cerium compounds such as ceria and cerium nitrate
isotopes from cerium-119 to cerium-157, with four stable isotopes
cerium in catalysts, polishing and pigments
Identifiers
symbol Ce
CAS 7440-45-1
Standards and regulation
Chemical safety data sheets
Rare earth trade and export rules
Nanomaterial regulation for ceria nanoparticles
Failure modes and hazards
Pyrophoricity of fine metal and alloys
Supply concentration
Nanoparticle exposure questions under study
Also called
+12
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.cerium
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Identify What cerium is.
Identity.
Properties
Properties.
Properties
Properties.
- What are the physical and chemical properties of cerium, including its two oxidation states? definition
- Is the question about cerium or a neighbouring lanthanide? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- Which isotopes exist, and which are stable? definition
- Which entry fits the specific isotope? action
Source Occurrence and production.
Supply.
Occurrence
Occurrence.
Occurrence
Occurrence.
- Where does cerium occur, and how is it separated from other rare earths? provenance
- Which entry fits rare earth mining? action
Supply
Supply.
Supply
Supply.
- Who produces cerium, and how does its abundance affect price, with sources? measurement
- Which sources are cited? provenance
Use Uses and safety.
Application.
Uses
Uses.
Uses
Uses.
- How is cerium used in catalysts, polishing, lighters, glass and pigments? provenance
- Which entry fits ceria? action
Safety
Safety.
Safety
Safety.
- What hazards does cerium present, and what is known about ceria nanoparticles? provenance
- Is the user asking about a personal exposure, which needs a clinician or poison centre? boundary
Context History.
Context.
Discovery
Discovery.
Discovery
Discovery.
- How was cerium discovered in 1803, and how was it named after the asteroid Ceres? provenance
- Which references are standard? provenance
Teach
Teaching.
Teach
Teaching.
- How is cerium used to teach lanthanide chemistry? provenance
- Which entry fits the periodic table? action
What the second pass must settle
- Should isotopes and ceria be separate entries?
- How should reference data be linked?
- The registry entry has merged aliases naming isotopes; should they be split off?