Bonding · SHS1 Chemistry

Lesson notes

Learning Objectives

Indicator: 1.2.2.LI.3 - Explain metallic bonding, its formation, factors that affect its formation and properties of metals

By the end of the lesson, learners can:

Define metallic bonding as the electrostatic attraction between a lattice of positive metal ions and a sea of delocalised electrons.
Explain, with the aid of a labelled diagram or model, how metallic bonding is formed in terms of electron loss and delocalisation.
State and explain at least three factors that affect the strength of metallic bond formation, such as charge on the ion, number of delocalised electrons and ionic radius.
Relate the characteristic properties of metals (conductivity, malleability, ductility, high melting and boiling points, lustre) to the nature of metallic bonding.
Construct a mind map summarising metallic bonding, its formation, influencing factors and resulting properties.

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Curriculum details

Strand: Systematic Chemistry of the Elements (Strand 2)
Sub-strand: Bonding (2.2)
Content standard: 1.2.2.CS.1 - Demonstrate knowledge and understand of the formation and properties of inter-atomic bonding. 1.2.2.LO.1 Predict and explain ionic, covalent and metallic bonding as well as their characteristic properties. 1.2.2.LO.2 Predict and describe the type of intermolecular bonds that will be formed between a group of compounds
Indicator: 1.2.2.LI.3 - Explain metallic bonding, its formation, factors that affect its formation and properties of metals
Suggested placement: Semester 2, Week 13 (Week 33 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 51

Exemplars (from the NaCCA curriculum)

Use of Digital Resources: Watch a video or listen to a presentation (with the aid of relevant charts) on metallic bonding.
Activity-Based Learning:
- Based on the presentation, design a mind map on the explanation of metallic bonding, factors that affect its formation as well as its properties.
- Work individually to design models to show metallic bonding (lattice of positive ions in a pool of electrons).
Talk for Learning:
- Explain each of the factors that affect metallic bond formation.
- Discuss the properties of metallic solids and link the properties to metallic bonding.
Teaching and Learning Materials:
- WEBSITES * https://study.com/academy/lesson/cation-definition-examples-quiz.html atomic models, https://www.khanacademy.org/science/in-in-class-10-chemistry-india/x87dd2847d57ee419:in-in-metals-and-non- metals/x87dd2847d57ee419:in-in-metals-reacting-with-nonmetals/v/ionic-bonds-reaction-of-metals-non-metals-metals- and-non-metals-chemistry-khan-academy * atomic models, diagrams https://www.khanacademy.org/science/in-in-class-10-chemistry-india/x87dd2847d57ee419:in- in-carbon-and-its-compounds-coming-soon/x87dd2847d57ee419:in-in-bonding-in-carbon-covalent-bond/v/covalent- bond-and-lewis-dot-structure-h2o-co2-chemistry-khan-academy
- CHARTS * Chart on ionic, covalent and metallic bonds
- diagrams
Assessment (1.2.2.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.