# Explain why metals have high melting points and are good conductors of electricity.

> Edexcel A-Level Chemistry (9CH0) — 2.3 Metallic bonding · Explain · 5 marks

> Metals are widely used in construction and electrical wiring due to their physical properties. These properties can be explained by metallic bonding.

## Mark scheme (5 marks)

1. In metallic bonding, metal atoms lose their outer electrons to form positive ions (cations)
2. A 'sea' of delocalised electrons surrounds the positive ions
3. Strong electrostatic attraction between the positive ions and the delocalised electrons holds the structure together
4. A large amount of energy is needed to break these strong electrostatic attractions, explaining the high melting point
5. The delocalised electrons can move freely through the structure and carry charge, explaining electrical conductivity

## Related

- [Revision notes for Edexcel A-Level Chemistry (9CH0)](https://www.gradenine.co.uk/learn)
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