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.
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 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.
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; trivalent chromium is an essential trace element in small amounts, 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.
What it is for: Stainless steel, plating, pigments and tanning.
It can be relay properties and isotopes; explain production and uses; distinguish oxidation states and health effects; route exposure questions.
Distinguishing features
Corrosion resistance
Stainless steel component
Toxic hexavalent state
Contact allergen
What it looks like
A silvery, hard, bright metal that takes a high polish.
Physical character
atomic number: 24 Z
standard atomic weight: 51.996 u
melting point: 1907 degrees C
Mohs hardness: 8.5 scale
How it is recognised
Element 24, symbol Cr
Metal of stainless steel and chrome plating
Vanadium and manganese are the neighbouring elements
Related models
is a kind of - in registry terms
is a kind of - in registry terms
is a kind of - in registry terms
is used in - the main application
In practice
Families and kinds
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
Identifiers
symbol Cr
CAS 7440-47-3
Standards and regulation
Occupational exposure limits for hexavalent chromium
REACH restrictions on chromium VI in leather and articles
Drinking water standards
RoHS limits in electronics
Failure modes and hazards
Hexavalent chromium toxicity and cancer
Contact dermatitis from chromium in cement and leather
Groundwater contamination
Confusing oxidation states
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.chromium
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 chromium is.
Identity.
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.
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.
Application.
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.
Context.
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
What the second pass must settle
- 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?