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Shell - GCSE Physics Definition

Reviewed by: Caroline Carroll

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In GCSE Physics, the term "shell" often refers to the energy level that electrons occupy around the nucleus of an atom. These shells can be thought of as layers or paths that electrons move in, and each one can hold a specific number of electrons. The first shell can hold up to 2 electrons, the second can hold up to 8, and so on. When an electron gains or loses energy, it can move between these shells in a process known as electron transition.

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Caroline Carroll

Reviewer: Caroline Carroll

Expertise: Physics & Chemistry Subject Lead

Caroline graduated from the University of Nottingham with a degree in Chemistry and Molecular Physics. She spent several years working as an Industrial Chemist in the automotive industry before retraining to teach. Caroline has over 12 years of experience teaching GCSE and A-level chemistry and physics. She is passionate about creating high-quality resources to help students achieve their full potential.

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