Specification Point 1.52C (Paper 2C Only):
Know how to represent a metallic lattice by a 2-D diagram

Metallic Lattice as a Diagram

  • Metal atoms are held strongly to each other by metallic bonding.
  • In the metal lattice, the atoms lose their valence electrons and become positively charged.
  • The valence electrons no longer belong to any metal atom and are said to be delocalised.
  • They move freely between the metal ions like a sea of electrons.

Metallic Lattice: Giant three-dimensional lattice structure of positive ions surrounded by a sea of delocalised electrons.

Diagram:

The outer shell of (valence) electrons are detached from the atoms and are delocalised throughout the structure

Specification Point 1.53C (Paper 2C Only):
Understand metallic bonding in terms of electrostatic attractions

Electrostatic Attractions

Metallic Bonding: The attraction between the positive ions and delocalised electrons that keeps the ions together.

Examples of Metallic Compounds:

Metallic structures Edexcel IGCSE Chemistry

The metallic structure of Zinc and Sodium

Specification Point 1.54C (Paper 2C Only):
Explain typical physical properties of metals, including electrical conductivity and malleability

Physical Properties

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.