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Development of the Atomic Model

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Page 1: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

Development of the Atomic Model

Page 2: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

400 B.C. – Democritus

• He thought atoms were “un-cuttable”

• Also atoms are hard small particles

Page 3: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

1808-Dalton

• He believed that all substances are made of atoms.

• Atoms of the same element are exactly alike, and with different elements are different.

• He made experiments in combining elements.

Page 4: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

1897-Thomson

• The atomic structure was led to the plum-pudding model.

• Discovered the electron

• He made a cathode-ray tube experiment

Page 5: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

1911-Rutherford • The electrons move in empty space in the

atom

• Discovered the nucleus

• Performed the gold foil experiment

• Inside are small negatively changed particles in a atom

Page 6: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

1913-Bohr

• Electrons travel in definite paths; orbit the nucleus

• The electrons jump from path to path.

Page 7: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

1926-Schrodinger

• The electrons path cannot be predicted

• The electrons are found in the electron cloud not paths

Page 8: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

Word reminder

• Democritus- snowflake or popcorn .

• Dalton-ball

• Thomson-chocolate chip cookie

• Rutherford- sprinkle doughnut

• Bohr- plants

• Schrodinger-electron cloud

Page 9: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

1)Who believed that the electrons were found in electron cloud ? 2) Who thought that jump from path to path?

1) A) Bohr

B) Schrodinger

C) Rutherford

D) Thomson

2) A) Bohr

B) Dalton

C) Democritus

D) Rutherford

Page 10: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

1) Who believed that atoms are “uncuttable”?2)Who believed that atoms of the same element are exactly alike?

• 1) a) Dalton

b) Democritus

c) Thomson

d) Bohr

• 2) a ) Dalton b ) Bohr

c ) Rutherford

d ) no clue.

Page 11: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

Thomson conducted what experiment?

• A) Experiment in combining elements.

• B) Gold foil experiment

• C) Cathode-ray tube

• D) Electron clouds

Page 12: Development of the Atomic Model. 400 B.C. – Democritus He thought atoms were “un-cuttable” Also atoms are hard small particles

THE END (:


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