Metallic bonding
Metallic bonding

A metal is a giant lattice of positive metal ions surrounded by delocalised electrons. These electrons are free to move through the whole structure rather than being held between two particular atoms.
Step-by-step lessons on Edexcel GCSE Chemistry 2.5.5 Properties of metals and non-metals. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.