Multiple Bond¶
In chemistry, bond order is a formal measure of the multiplicity of a covalent bond between two atoms.
Core Idea¶
Multiple Bond is treated here as the recurring natural science, engineering, and health identity summarized by this source-grounded definition: In chemistry, bond order is a formal measure of the multiplicity of a covalent bond between two atoms. In chemistry, bond order is a formal measure of the multiplicity of a covalent bond between two atoms. As introduced by Gerhard Herzberg, building off of work by R. Mulliken and Friedrich Hund, bond order is defined as the difference between the numbers of electron pairs in bonding and antibonding molecular orbitals.
Scope of Application¶
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Bond order in molecular orbital theory. Bond order is also an index of bond strength and is also used extensively in valence bond theory.
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Bond order in molecular orbital theory. A comprehensive method to compute bond orders from quantum chemistry calculations was published in 2017.
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Other definitions. The bond order concept is used in molecular dynamics and bond order potentials.
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Examples. The bond order itself is the number of electron pairs (covalent bonds) between two atoms.
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Examples. For example, in diatomic nitrogen N≡N, the bond order between the two nitrogen atoms is 3 (triple bond).
Clarity¶
A clear use of Multiple Bond names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is In chemistry, bond order is a formal measure of the multiplicity of a covalent bond between two atoms.
Manages Complexity¶
Multiple Bond compresses multiple natural science, engineering, and health details into a stable diagnostic relation. The source shows both the central mechanism—each Mo atom is linked to four Chloride| ligands by a bond with an order of 1.—and the practical consequence—the π-bond order between atoms r and s derived from Hückel theory was defined by Charles Coulson by using the orbital coefficients of the Hückel MOs.
Abstract Reasoning¶
- Type the carrier. Identify the natural science, engineering, and health entities to which the claim applies.
- State the relation. Use the source-grounded identity: In chemistry, bond order is a formal measure of the multiplicity of a covalent bond between two atoms.
- Check operation and conditions. The compound (terphenyl)–CrCr–(terphenyl) contains two chromium atoms linked to each other by a bond with an order of 5, and each chromium atom is linked to one terphenyl ligand by a single bond.
- Demand recognition evidence.
Knowledge Transfer¶
Within the home domain. Knowledge about Multiple Bond transfers literally when a new case preserves the same carrier type, relation, and recognition test. Bond order is also an index of bond strength and is also used extensively in valence bond theory. A comprehensive method to compute bond orders from quantum chemistry calculations was published in 2017. Beyond the home domain. No canonical parent is asserted for Multiple Bond. An outside case receives the specialist name only when the same typed roles and rejection conditions can be filled literally; otherwise the comparison remains an analogy pending later graph densification.
Relationships to Other Abstractions¶
Current abstraction Multiple Bond Domain-specific
Parents (1) — more general patterns this builds on
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Multiple Bond is a kind of Chemical Bond Domain-specific
Multiple Bond satisfies the defining boundary of Chemical Bond: A chemical bond is a stabilizing association among atoms or ions within a molecule, crystal, metal, or other chemical structure, arising from quantum-mechanical and electrostatic organization of nuclei and electrons and characterized by energy, distance, directionality, order, and electron distribution.
Children (1) — more specific cases that build on this
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Metal–Ligand Multiple Bond Domain-specific is a kind of Multiple Bond
Metal–Ligand Multiple Bond is a strict kind of Multiple Bond: it is a metal–ligand bond with substantial bonding beyond one sigma component.
Hierarchy path (1) — routes to 1 parentless root
- Multiple Bond → Chemical Bond → Relation
Neighborhood in Abstraction Space¶
Multiple Bond sits in a sparse region of the domain-specific corpus (75th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.
Family — Chemical Structure & Reactivity Concepts (22 abstractions)
Nearest neighbors
- Valence Bond Theory — 0.84
- Isovalent Hybridization — 0.84
- Umpolung — 0.84
- Radical Disproportionation — 0.83
- Corey–Pauling rules — 0.83
Computed from structural-signature embeddings · 2026-10-08