IB Chemistry Topic S2.4.1 Bonding as a Continuum Revision Notes (SL/HL)

IB Chemistry Topic S2.4.1 Bonding as a Continuum Revision Notes (SL/HL) | RevisionDojo

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Bonding Is Best Described as a Continuum

You’ve likely learned about the three primary types of chemical bonds: ionic, covalent, and metallic.
While these categories are helpful, most bonds don’t fit neatly into one type: they exist on a spectrum.
This idea of bonding as a continuum is elegantly captured in the bonding triangle, first developed by van Arkel and Ketelaar.

Example

Aluminium chloride $AlCl_3$ exhibits both ionic and covalent characteristics, while silicon shows a mix of covalent and metallic properties.

The Bonding Triangle

Definition

Bonding triangle

The bonding triangle is a triangular diagram that represents the relative contributions of ionic, covalent, and metallic bonding to a material.

Each corner of the triangle corresponds to a "pure" bonding type:
1. Ionic Bonding: Found in compounds like NaCl, where electrons are transferred from one atom to another.
2. Covalent bonding: found in molecules like $H_2$ or $Cl_2$, where electrons are shared between atoms.
3. Metallic Bonding: Found in metals like Cu or Fe, where electrons are delocalized and free to move.
The sides of the triangle represent intermediate bonding types:
1. Ionic–Covalent Continuum: Bonds with partial ionic and covalent character, such as in AgCl.
2. Covalent–Metallic Continuum: Bonds with partial covalent and metallic character, such as in silicon.
3. Metallic and ionic continuum: bonds with partial metallic and ionic character, such as in intermetallic compounds.

A compound's exact position on the triangle is set by two electronegativity-based measures, explained in the next section, S2.4.2 Position in the bonding triangle.

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Bonding Is Best Described as a Continuum

You’ve likely learned about the three primary types of chemical bonds: ionic, covalent, and metallic.
While these categories are helpful, most bonds don’t fit neatly into one type: they exist on a spectrum.
This idea of bonding as a continuum is elegantly captured in the bonding triangle, first developed by van Arkel and Ketelaar.

Example

Aluminium chloride $AlCl_3$ exhibits both ionic and covalent characteristics, while silicon shows a mix of covalent and metallic properties.

The Bonding Triangle

Definition

Bonding triangle

The bonding triangle is a triangular diagram that represents the relative contributions of ionic, covalent, and metallic bonding to a material.

Each corner of the triangle corresponds to a "pure" bonding type:
1. Ionic Bonding: Found in compounds like NaCl, where electrons are transferred from one atom to another.
2. Covalent bonding: found in molecules like $H_2$ or $Cl_2$, where electrons are shared between atoms.
3. Metallic Bonding: Found in metals like Cu or Fe, where electrons are delocalized and free to move.
The sides of the triangle represent intermediate bonding types:
1. Ionic–Covalent Continuum: Bonds with partial ionic and covalent character, such as in AgCl.
2. Covalent–Metallic Continuum: Bonds with partial covalent and metallic character, such as in silicon.
3. Metallic and ionic continuum: bonds with partial metallic and ionic character, such as in intermetallic compounds.

A compound's exact position on the triangle is set by two electronegativity-based measures, explained in the next section, S2.4.2 Position in the bonding triangle.

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Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

IB Chemistry S2.4.1 Bonding as a Continuum Notes

Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

Bonding Is Best Described as a Continuum

The Bonding Triangle

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Bonding Is Best Described as a Continuum

The Bonding Triangle

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