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The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.
The atomic nucleus contains protons and neutrons, themselves made of smaller particles called quarks. The force holding the quarks together is described by a theory using the idea of a conserved colour charge, a fundamental ingredient of the standard model of particle physics
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