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Elements and atoms | Atoms, compounds, and ions | Chemistry | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/ap-biology/chemistry-of-life/elements-of-life/v/elements-and-atoms How elements relate to atoms. The basics of how protons, electrons and neutrons make up an atom. Watch the next lesson: https://www.khanacademy ...
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