chromium
Let an agent identify chromium and its properties, relay production, uses, isotopes and health effects from reference sources, distinguish trivalent from hexavalent chromium, and route exposure questions to occupational health authorities.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Identify What chromium is.
Properties
Properties.
Properties
Properties.
- What are the physical and chemical properties of chromium? definition
- Is the question about the metal, a trivalent compound or a hexavalent compound? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- Which isotopes exist, and how is chromium-51 used in medicine? definition
- Which entry fits the specific isotope? action
Source Production and supply.
Production
Production.
Production
Production.
- How is chromium produced from chromite as ferrochrome and metal? provenance
- Which entry fits chromite? action
Supply
Supply.
Supply
Supply.
- Who produces chromium, and how is it traded, with sources? measurement
- Which sources are cited? provenance
Use Uses and health.
Uses
Uses.
Uses
Uses.
- How is chromium used in steel, plating, pigments, tanning and refractories? provenance
- Which references are standard? provenance
Health
Health and environment.
Health
Health.
- What are the health effects of trivalent and hexavalent chromium, and what limits apply, in general terms? provenance
- Is the user asking about personal exposure, which needs occupational health or medical advice? boundary
Context History and cases.
Discovery
Discovery.
Discovery
Discovery.
- How was chromium discovered by Vauquelin in 1797 and named for its coloured compounds? provenance
- Which entry fits the history of chemistry? action
Cases
Contamination cases.
Cases
Cases.
- What notable hexavalent chromium contamination cases have been documented, as reported? provenance
- Which entry fits the specific case? 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
- chromium-53, chromium-42, chromium-43, chromium-44, chromium-45, chromium-46, chromium-47, chromium-48, chromium-49, chromium-55, chromium-56, chromium-57
What it is Filled
A chemical element with symbol Cr and atomic number 24, a hard, lustrous, corrosion-resistant transition metal obtained from chromite ore, used above all in stainless steel and other alloys, in chrome plating, pigments, leather tanning and refractories; whether trivalent chromium has an essential nutritional role in humans is disputed, hexavalent chromium compounds are toxic and carcinogenic, and chromium is a common contact allergen, with four stable isotopes and radioactive ones from chromium-42 upward.
Why it exists Filled
Let an agent identify chromium and its properties, relay production, uses, isotopes and health effects from reference sources, distinguish trivalent from hexavalent chromium, and route exposure questions to occupational health authorities.
Distinguishing features Filled
- Corrosion resistance
- Stainless steel component
- Toxic hexavalent state
- Contact allergen
What robots and AI may and may not do Filled
Must not
- Treat all chromium compounds as equally safe when some states are toxic and carcinogenic.
- Handle chromium compounds or dust without the controls the material requires.
- Discharge chromium-bearing effluent to drains, soil or water.
- Misstate chromium content or supplement claims for health products.
Only with a human decision
- Any handling or disposal of chromium compounds, which belongs to a trained operator.
- Decisions about remediation of a contaminated site.
May
- Report chromium's chemistry, ores and industrial uses from reliable references.
- Distinguish the different oxidation states clearly in any report or label.
Moral aspects Filled
- Chromium contamination from plating and tanning has poisoned groundwater used by communities.
- Workers in plating and tanning bear the heaviest exposure.
Who is affected
- Plating and tanning workers
- Communities near contaminated sites
- Water users downstream
Owners Filled
Steward
Nobody owns the element; the operator or site holder answers for the material and its waste.
Links to other meta-models Filled
parent
- Q105789 - registry parent class
- Q186752 - registry parent class
- Q2512777 - registry parent class
related
- heavy metal - in registry terms
- allergen - in registry terms
- simple substance - in registry terms
- stainless steel - the main application
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.chromium
- Wikidata: Q725 (https://www.wikidata.org/wiki/Q725)
- symbol: Cr
- CAS: 7440-47-3
Direct properties required Filled
- atomic number: 24 Z
- standard atomic weight: 51.996 u
- melting point: 1907 degrees C
- Mohs hardness: 8.5 scale
Recognition required Filled
- Element 24, symbol Cr
- Metal of stainless steel and chrome plating
- Vanadium and manganese are the neighbouring elements
- A silvery, hard, bright metal that takes a high polish.
Capabilities and actions required Filled
- relay properties and isotopes
- explain production and uses
- distinguish oxidation states and health effects
- route exposure questions
Hazards and failure modes required Filled
- Hexavalent chromium toxicity and cancer
- Contact dermatitis from chromium in cement and leather
- Groundwater contamination
- Confusing oxidation states
Standards and interfaces required Filled
- Occupational exposure limits for hexavalent chromium
- REACH restrictions on chromium VI in leather and articles
- Drinking water standards
- RoHS limits in electronics
Context of use required Filled
- Stainless steel, plating, pigments and tanning.
- chromium metal and ferrochrome
- trivalent chromium compounds
- hexavalent chromium compounds such as chromates
- chromium pigments such as chrome yellow and chromium oxide green
- stable isotopes 50, 52, 53 and 54 and radioactive isotopes such as chromium-51
Sources Filled
- Wikidata item Q725: chromium - identity and sense of the item
- Wikipedia: Chromium - general description of the item
Open questions
- Should hexavalent chromium be a separate primary entry?
- How should exposure limits 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-q725/spec.json