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History of the Atomic Model

History of the Atomic Model. Democritus (400 BC). History of the Atomic Model. Democritus (400 BC) Reasoned that matter was composed of a few indivisible units that combine to make everything around us. History of the Atomic Model. Democritus (400 BC) John Dalton (1800).

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History of the Atomic Model

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  1. History of the Atomic Model • Democritus (400 BC)

  2. History of the Atomic Model • Democritus (400 BC) • Reasoned that matter was composed of a few indivisible units that combine to make everything around us.

  3. History of the Atomic Model • Democritus (400 BC) • John Dalton (1800)

  4. History of the Atomic Model • Democritus (400 BC) • John Dalton (1800) • Conducted experiments that showed small units of matter (atoms) combine in specific ways.

  5. History of the Atomic Model • Democritus (400 BC) • John Dalton (1800) • J.J. Thompson (1897)

  6. CRT animation

  7. Plumb pudding model

  8. Dr. Cox on Thompson

  9. History of the Atomic Model • Democritus (400 BC) • John Dalton (1800) • J.J. Thompson (1897) • Squeezed electrons out of atoms demonstrating that atoms are made of smaller particles. Thompson is responsible for the plumb pudding (chocolate chip cookie) model.

  10. History of the Atomic Model • Democritus (400 BC) • John Dalton (1800) • J.J. Thompson (1897) • Ernest Rutherford (1898)

  11. How it works Dr. Cox on Rutherford

  12. History of the Atomic Model • Democritus (400 BC) • John Dalton (1800) • J.J. Thompson (1897) • Ernest Rutherford (1898) • Demonstrated that atoms contain small heavy positively charged centers. We call that center the nucleus.

  13. History of the Atomic Model • Democritus (400 BC) • John Dalton (1800) • J.J. Thompson (1897) • Ernest Rutherford (1898) • Niels Bohr

  14. Bohr model

  15. History of the Atomic Model • Democritus (400 BC) • John Dalton (1800) • J.J. Thompson (1897) • Ernest Rutherford (1898) • Niels Bohr • Demonstrated that electrons exist in specific energy levels. As electrons drop from high to low orbitals only specific colors of light are released.

  16. History of the Atomic Model • Democritus (400 BC) • John Dalton (1800) • J.J. Thompson (1897) • Ernest Rutherford (1898) • Niels Bohr (1915) • Erwin Schrodinger and Werner Heisenburg (1926)

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