"Electrons revolve around the nucleus like planets." ✅ Correct: Bohr’s model said this, but the Quantum model says electrons exist in probability clouds (orbitals). Modern chemistry follows the Quantum model.
Yes. The photoelectric effect (dual nature of radiation) is a core part of the chapter. Pay special attention to the graph of Kinetic Energy vs. Frequency.
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Based on the Alpha Particle Scattering experiment. It proposed a tiny, dense, positively charged nucleus . "Electrons revolve around the nucleus like planets
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For curated revision notes with previous year questions. The photoelectric effect (dual nature of radiation) is
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Failed for multi-electron atoms, couldn’t explain fine spectra, Zeeman effect.