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Atomic Models

History of atoms. Atomic Models. Dalton’s Model (B) . Billiard Ball Model It is a neutral solid sphere. Smallest unit of matter . Neutral (no charge) . JJ. Thomson’s Model (D) . Plum Pudding Model Negatively-charged particles called electrons Soft positively charged sphere

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Atomic Models

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  1. History of atoms Atomic Models

  2. Dalton’s Model (B) Billiard Ball Model • It is a neutral solid sphere. • Smallest unit of matter Neutral (no charge)

  3. JJ. Thomson’s Model (D) Plum Pudding Model • Negatively-charged particles called electrons • Soft positively charged sphere • Overall neutral Electrons – negatively charged particles Positively charged sphere

  4. Rutherford’s Experiment

  5. Rutherford’s Model (A) R Nuclear Model Not a solid sphere but mostly empty space. Nucleus is dense, positively charged, and in the center. Electrons are tiny and negatively charged.

  6. Bohr Model (E) • Solar System Model • Protons (positively charged particles) and neutrons (neutral particles) concentrated in center • Electrons are located at specific distances from nucleus (energy levels).

  7. Quantum Model (C) • Electron Cloud • Nucleus consist of protons (positive charge) and neutrons (neutral). • Electrons are constantly moving in a cloud around the nucleus.

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