# Explain why magnesium has a high melting point and conducts electricity.

> Edexcel GCSE Chemistry (1CH0) — 1.7 Types of substance · Explain · 4 marks

> Magnesium is a metal used in lightweight alloys for aircraft and sports equipment. It is a solid at room temperature and is a good electrical conductor.

## Mark scheme (4 marks)

1. Magnesium has a giant metallic structure / lattice
2. There are strong electrostatic forces of attraction between the positive ions and the delocalised electrons
3. A large amount of energy is needed to overcome these strong forces, hence the high melting point
4. Delocalised electrons are free to move through the structure and carry charge, allowing electrical conduction

## Related

- [Revision notes for Edexcel GCSE Chemistry (1CH0)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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