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Define proton number (atomic number) as the number of protons in the nucleus of an atom
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Chemistry| Proton number| Nucleon number| IGCSE| GCSE| AQA| O level| Cambridge Checkpoint
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Atomic number, atomic mass, protons, neutrons and electrons: from fizzics.org
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Atoms for Kids | What is an atom? | Learn about atoms and molecules with activities and worksheets
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Atomic Structure: Protons, Electrons & Neutrons
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What Are Quarks? Explained In 1 Minute
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