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Explore the fundamentals of atoms, from ancient ideas to Dalton's theory, Bohr's model, and electronic configuration in clear notes.
Learn how scientists turn observations into measurements, use symbols, build models, and revise ideas in physics, chemistry, biology and earth science.
Explore early attempts to classify elements, covering Dobereiner’s triads, Newlands’ law of octaves and Mendeleev’s table with examples and key details.
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