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.
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 praseodymium 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 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.
What it is for: Alloys, magnets, pigments and optical glass.
It can be relay properties and isotopes; explain production and uses; relay safety information; distinguish from other lanthanides.
Distinguishing features
Green salts
Single stable isotope Pr-141
Magnet and alloy additive
Optical filtering
What it looks like
A soft, silvery metal that develops a green oxide coating in air.
Physical character
atomic number: 59 Z
standard atomic weight: 140.908 u
melting point: 931 degrees C
density: 6.77 g/cm3
How it is recognised
Element 59, symbol Pr
Lanthanide with green compounds
Cerium and neodymium are the neighbouring lanthanides
Related models
is a kind of - in registry terms
is a kind of - in general terms
is adjacent to - element 58
is adjacent to - element 60
In practice
Families and kinds
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
Identifiers
symbol Pr
CAS 7440-10-0
Standards and regulation
Chemical safety data sheets
Rare earth trade and export rules
Critical raw material listings
Failure modes and hazards
Flammability of fine metal
Supply concentration
Confusion with neodymium in magnet contexts
Also called
+15
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.praseodymium
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 praseodymium is.
Identity.
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.
Supply.
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.
Application.
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.
Context.
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
What the second pass must settle
- Should isotopes be separate entries?
- How should reference data be linked?
- The registry entry has merged aliases naming isotopes; should they be split off?