# Nitrogen has atomic number 7 and mass number 14. A different isotope of nitrogen has mass number 15. State the number of protons, neutrons and electrons in one atom of nitrogen-14, and explain how the structure of a nitrogen-15 atom differs from a nitrogen-14 atom.

> Pearson Edexcel International GCSE Chemistry (4CH1) — 1.3 Atomic structure · State and Explain · 4 marks

## Mark scheme (4 marks)

1. Nitrogen-14 has 7 protons
2. Nitrogen-14 has 7 neutrons
3. Nitrogen-14 has 7 electrons
4. Nitrogen-15 has one more neutron (8 neutrons) than nitrogen-14 but the same number of protons (and electrons)

## Key terms

- [atomic number](https://www.gradenine.co.uk/glossary/atomic-number)
- [mass number](https://www.gradenine.co.uk/glossary/mass-number)
- [isotope](https://www.gradenine.co.uk/glossary/isotope)
- [neutron](https://www.gradenine.co.uk/glossary/neutron)
- [proton](https://www.gradenine.co.uk/glossary/proton)
- [electron](https://www.gradenine.co.uk/glossary/electron)

## Related

- [Revision notes for Pearson Edexcel International GCSE Chemistry (4CH1)](https://www.gradenine.co.uk/learn)
- [How to answer "State and Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/nitrogen-has-atomic-number-7-and-155c670e) · Published by Druglandscape Ltd.