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

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

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

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

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

13. CRT animation

21. Plumb pudding model

24. Dr. Cox on Thompson

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

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

33. How it works Dr. Cox on Rutherford

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

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

44. Bohr model

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

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

53. What is it…wave or particleWhat is it…wave or particle? Lame song

54. History of the Atomic Model Democritus (400 BC) Democritus (400 BC) John Dalton (1800) John Dalton (1800) J.J. Thompson (1897) J.J. Thompson (1897) Ernest Rutherford (1898) Ernest Rutherford (1898) Niels Bohr (1915) Niels Bohr (1915) Erwin Schrodinger and Werner Heisenburg (1926) Erwin Schrodinger and Werner Heisenburg (1926) Electrons are weird. More like clouds than particles. Electrons are weird. More like clouds than particles.