# Explain why metals are good conductors of electricity.

> Cambridge International IGCSE Chemistry (0620) — 2.7 Metallic bonding · Explain · 4 marks

## Mark scheme (4 marks)

1. Metals contain a lattice of positive ions (cations)
2. There are delocalised electrons present
3. The delocalised electrons can move throughout the metal
4. When a voltage / potential difference is applied, the delocalised electrons move towards the positive terminal, carrying charge

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