Pearson Edexcel International GCSE Chemistry · specification 4CH1 · Paper 2 | Whole paper: All content including bold C statements · Free · no account needed
1(h) Metallic bonding (4CH1 specification)
Positive ions in a sea of delocalised electrons, and the three properties that follow immediately.
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- Metallic Bonding — A lattice of positive ions in a sea of electrons that belong to no atom in particular.
The teaching route this belongs to: Topic 1 · Principles of chemistry (Chemistry) — the lessons in order, with every gate.
Specification coverage
Topic 1 Principles of chemistry (h) Metallic bonding — statements 1.61–1.62C (includes bold C statements assessed on Paper 2 only)
Assessment objectives: AO1, AO2. Suggested learning time: 35 minutes.
Required knowledge
- The structure of a metal as a lattice of positive ions in a sea of delocalised electrons
- Bold C statements: explaining the malleability and conductivity of metals in terms of this structure
Required skills
- Explain conductivity, malleability and high melting point from one model
How it is examined
- Multiple-choice and short-answer recall
- Application of the content to an unfamiliar context
- Extended open-response, marked on the quality of a connected explanation
Common mistakes
- Saying metals are malleable 'because they are soft'. Layers of ions slide over one another while the delocalised electrons hold the structure together.
- Describing metallic bonding as electrons being shared between two atoms, which is covalent bonding.
This page maps the specification. The pages above teach it, and the Chemistry lessons hold the whole course — completely free.