Type to see ranked matches. Use the up and down arrow keys to choose a result, then press Enter to open it.
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Keyboard graph navigation: press N for concepts or E for relations; use arrow keys, Home, and End to move; Enter selects; Shift plus Enter selects and centers; plus and minus zoom; zero fits; Escape clears the selection. Use the visible viewport buttons as alternatives to dragging, wheel, and pinch gestures.
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Select any concept, construction junction, or annotated relation by pointer, touch, search, or keyboard.
Construction junctions are diamonds. They show where multiple structures must coexist on the same carrier and satisfy compatibility conditions.
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Single-pointer and keyboard alternatives to dragging. Each activation moves the selected concept one step.
source: Has model / approximation; target: Model / approximation of
Authored annotation
realized as element table
Authored explanation
The table is a conventional spatial realization of periodic ordering; alternative table layouts can represent the same law.
How to interpret this relation type
The target is a model, idealization, restricted ansatz, approximation scheme, phenomenological fit, or historical representation used for the source system or theory. It need not have a universal small error parameter and is not thereby a controlled limit or effective theory. The edge label and detail must identify the precise status.
source: Has state / property description; target: State / property description of
Authored annotation
maps model-dependent atomic size
Authored explanation
Atomic radius is a context-dependent size descriptor inferred from specified states or structures; periodic patterns depend on the chosen covalent, metallic, ionic, or other radius definition.
How to interpret this relation type
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
source: Describes / governs; target: Described / governed by
Authored annotation
orders elements by proton number
Authored explanation
The modern table orders chemical elements by proton number and groups them using recurring electronic and chemical properties.
How to interpret this relation type
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
source: Has state / property description; target: State / property description of
Authored annotation
maps electron-addition energetics
Authored explanation
Electron affinities provide a periodic energetic descriptor, with shell structure, correlation, spin, molecular environment, and sign convention producing important exceptions.
How to interpret this relation type
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
source: Has state / property description; target: State / property description of
Authored annotation
maps comparative electron attraction
Authored explanation
Electronegativity values form a model-dependent periodic descriptor; trends are useful but vary with definition, oxidation state, bonding environment, and relativistic effects.
How to interpret this relation type
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
source: Has state / property description; target: State / property description of
Authored annotation
maps recurring formal valence states
Authored explanation
Recurring oxidation states provide a formal periodic descriptor for electron bookkeeping, but they do not by themselves specify charge distribution or bonding.
How to interpret this relation type
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
source: Has state / property description; target: State / property description of
Authored annotation
partitions elements by block
Authored explanation
The conventional periodic table displays s-, p-, d-, and f-blocks as regions that organize recurring electron-configuration and chemical-property patterns without making every trend exact.
How to interpret this relation type
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
source: Contributes to; target: Contains theory component
Authored annotation
organizes d-block trends and families
Authored explanation
The periodic table supplies the d-block organization used to compare transition-metal valence, oxidation states, radii, and recurring chemical behavior; exceptions require element-specific electronic and relativistic analysis.
How to interpret this relation type
The source supplies a substantive formal ingredient, dynamical sector, law, field content, or mechanism of the target theoretical framework.