transition metal

Confirmed element identity

Record the element being assessed and the evidence connecting a material observation to that element.

1. Which element name, symbol and atomic number does this record represent? definition
2. Which analytical result or authoritative record establishes the element's identity, and does it establish chemical form as well? provenance

Electronic membership evidence

Connect the classification decision to the qualifying atomic or cationic electronic state.

1. Which transition-metal definition is being applied, and which atomic or cationic configuration satisfies it? definition
2. Would another relevant convention change membership, particularly for group 3, group 12 or elements discussed as inner transition elements? boundary

Supported electronic assignment

Record the electronic assignment for the observed species, including mixed or unresolved states.

1. Which oxidation states and formal d-electron counts are assigned to the metal species present? definition
2. Which measurements support these assignments, and can they distinguish mixed valence or alternative interpretations? measurement

Resolved metal environment

Record coordination evidence without treating a compound's complete structure as a property of the element.

1. Which ligands or neighbouring atoms, coordination numbers and geometries are supported for the metal sites? measurement
2. Which compound, complex or solid-phase model owns each environment, and are multiple environments unresolved? boundary

Metal-bearing material identity

Record metal content, impurities and phase evidence before interpreting material properties.

1. What measured composition and phase evidence distinguish elemental metal from an alloy, oxide, salt or mixture? measurement
2. Which impurities or secondary phases could account for the observed response, and what are their detection limits? measurement

Surface state relevance

Establish whether surface composition and dispersion support the intended comparison or action.

1. What evidence describes particle size or dispersion and any oxide, adsorbate or other surface layer? measurement
2. Does the current surface condition require re-characterization before the proposed catalytic, electrochemical or material use? action

Qualified redox evidence

Record the conditions and limitations governing a proposed change in metal oxidation state.

1. Which redox couple and potential were measured, against which reference electrode and in what medium? measurement
2. What evidence addresses reaction rate, passivation or competing chemistry under the proposed oxidation or reduction conditions? action

Interpretable electronic response

Preserve measurement context and competing causes of magnetic or spectral observations.

1. Which magnetic or spectroscopic observations constrain the proposed metal electronic state, and under what conditions? measurement
2. Could impurities, multiple species, collective solid-state effects or non-metal-centred transitions explain the response? boundary

Demonstrated metal role

Link application claims to tested species, performance criteria and operating conditions.

1. Which exact metal form has demonstrated the proposed catalytic, electrical, magnetic or structural role, and against what performance criterion? provenance
2. What additional evidence is needed before substituting this metal or transferring the result to another oxidation state, support or material form? action

Bounded operation decision

Record the evidence and linked assessments required to support an operation on the identified metal-bearing material.

1. Which oxidation-state, coordination, phase or surface changes are expected from the proposed operation, and how will they be checked? action
2. Which hazard and process assessments apply to this exact species and form, including any powder, aerosol or dissolved-metal exposure created by the operation? boundary

Kinds and varieties

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these kinds and varieties hold for the sense of transition metal this model covers, and on what evidence? provenance

Identifiers and schemes

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these identifiers and schemes hold for the sense of transition metal this model covers, and on what evidence? provenance

Standards and regulation

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these standards and regulation hold for the sense of transition metal this model covers, and on what evidence? provenance

Real-world use

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these real-world use hold for the sense of transition metal this model covers, and on what evidence? provenance

Typical measurements

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these typical measurements hold for the sense of transition metal this model covers, and on what evidence? provenance

Failure modes and hazards

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these failure modes and hazards hold for the sense of transition metal this model covers, and on what evidence? provenance

Regional variation

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these regional variation hold for the sense of transition metal this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of transition metal this model covers, and on what evidence? provenance