praseodymium
Let an agent identify praseodymium and its properties, relay production, uses, isotopes and history from reference sources, relay safety information, and distinguish it from neighbouring lanthanides.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Identify What praseodymium is.
Properties
Properties.
Properties
Properties.
- What are the physical and chemical properties of praseodymium? definition
- Is the question about praseodymium 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.
Occurrence
Occurrence.
Occurrence
Occurrence.
- Where does praseodymium occur, and how is it separated from other rare earths? provenance
- Which entry fits rare earth mining? action
Supply
Supply.
Supply
Supply.
- Who produces praseodymium, and how is it traded, with sources? measurement
- Which sources are cited? provenance
Use Uses and safety.
Uses
Uses.
Uses
Uses.
- How is praseodymium used in magnets, alloys, glass and pigments? provenance
- Which entry fits neodymium magnet? action
Safety
Safety.
Safety
Safety.
- What hazards does praseodymium present, and how is it handled? provenance
- Is the user asking about a personal exposure, which needs a clinician or poison centre? boundary
Context History.
Discovery
Discovery.
Discovery
Discovery.
- How was praseodymium separated from didymium by Auer von Welsbach in 1885, and how was it named? provenance
- Which references are standard? provenance
Teach
Teaching.
Teach
Teaching.
- How is praseodymium used to teach lanthanide chemistry? provenance
- Which entry fits the periodic table? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
- Other names and narrower kinds
- praseodymium-121, praseodymium-122, praseodymium-123, praseodymium-124, praseodymium-125, praseodymium-126, praseodymium-127, praseodymium-127m, praseodymium-128, praseodymium-129, praseodymium-129m, praseodymium-130
What it is Filled
A chemical element with symbol Pr and atomic number 59, a soft, silvery, malleable lanthanide that tarnishes in air and forms green trivalent compounds; praseodymium is used in high-strength magnesium alloys for aircraft engines, in neodymium magnets as an additive, in yellow glass and ceramic pigments and in welders goggles, is recovered from monazite and bastnasite, and has one stable isotope, praseodymium-141.
Why it exists Filled
Let an agent identify praseodymium and its properties, relay production, uses, isotopes and history from reference sources, relay safety information, and distinguish it from neighbouring lanthanides.
Distinguishing features Filled
- Green salts
- Single stable isotope Pr-141
- Magnet and alloy additive
- Optical filtering
What robots and AI may and may not do Filled
Must not
- Handle fine praseodymium metal powder without fire controls.
- Dispose of rare earth processing waste into water or soil.
- Hide the origin of rare earth supplies in reporting.
- Present uncertain toxicity as settled in either direction.
Only with a human decision
- Handling bulk metal powders in a workplace.
May
- Describe praseodymium, its compounds and uses from reference sources.
- Report supply sources and certification where records exist.
Moral aspects Filled
- Rare earth extraction often leaves polluted land and water near the mines.
- Supply concentration makes praseodymium subject to trade pressure.
Who is affected
- Mine and refinery workers
- Communities near processing
- Users of magnets and alloys
Owners Filled
Steward
Nobody owns the element; mine operators, refiners and holders answer for the material.
Links to other meta-models Filled
parent
- Q19569 - registry parent class
related
- lanthanide - in registry terms
- rare earth element - in general terms
- cerium - element 58
- neodymium - element 60
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.praseodymium
- Wikidata: Q1386 (https://www.wikidata.org/wiki/Q1386)
- symbol: Pr
- CAS: 7440-10-0
Direct properties required Filled
- atomic number: 59 Z
- standard atomic weight: 140.908 u
- melting point: 931 degrees C
- density: 6.77 g/cm3
Recognition required Filled
- Element 59, symbol Pr
- Lanthanide with green compounds
- Cerium and neodymium are the neighbouring lanthanides
- A soft, silvery metal that develops a green oxide coating in air.
Capabilities and actions required Filled
- relay properties and isotopes
- explain production and uses
- relay safety information
- distinguish from other lanthanides
Hazards and failure modes required Filled
- Flammability of fine metal
- Supply concentration
- Confusion with neodymium in magnet contexts
Standards and interfaces required Filled
- Chemical safety data sheets
- Rare earth trade and export rules
- Critical raw material listings
Context of use required Filled
- Alloys, magnets, pigments and optical glass.
- praseodymium metal and alloys
- praseodymium compounds such as the oxide and chloride
- isotopes from praseodymium-121 to praseodymium-159, with Pr-141 stable
- praseodymium in magnets, glass and pigments
Sources Filled
- Wikidata item Q1386: praseodymium - identity and sense of the item
- Wikipedia: Praseodymium - general description of the item
Open questions
- Should isotopes be separate entries?
- How should reference data be linked?
- The registry entry has merged aliases naming isotopes; should they be split off?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1386/spec.json