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ScienceMentor

Learn with Mentor · 9 min

Atomic Structure: Protons, Neutrons and Electrons

Build a simple atom model, then use protons, neutrons and electrons to explain charge, mass number, isotopes and ions.

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Atoms have structure

An atom is not a tiny solid ball. It has a small, dense nucleus at the centre and electrons in the much larger region around it. The model is simplified, but it helps explain charge, mass and chemical behaviour.