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Early History of the Atom

Published byΓιάννη Γιάγκος Modified over 6 years ago

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Presentation on theme: "Early History of the Atom"— Presentation transcript:

1 Early History of the Atom

2 Matter Anything with mass and volume Composed of atoms

3 Research Hypothesis Theory An educated guess based on an observation
A broad set of observations that have been supported with repeated testing Theory

4 Dalton Developed the first theory of the structure of the atom
( ) Developed the first theory of the structure of the atom “Billiard Ball” Model of the atom Dalton’s “Billiard Ball” Model

5 Dalton’s Theory All elements are made up of tiny indivisible particles. Atoms of the same element are identical. The atoms of one element are different from the atoms of another element. Atoms of different elements chemically combine to form chemical compounds. During chemical reactions, atoms are rearranged. Atoms of one element cannot be changed into the atoms of another element in a chemical change.

6 Thomson Experimented with cathode ray tubes
(1856 – 1940) Experimented with cathode ray tubes Discovered negatively charged electrons “Plum Pudding” model of the atom Thomson’s “Plum Pudding” Model

7 Thomson’s Exp. Cathode Ray Tube Negative Plate Cathode Positive
Deflected Cathode Ray Tube

8 Rutherford’s “Nuclear” Model
(1871 – 1937) Experimented with alpha particles and gold foil Discovered the positively charged nucleus (protons) “Nuclear” model of the atom Rutherford’s “Nuclear” Model

9 Rutherford’s Gold Foil Experiment
Rutherford’s Exp. Rutherford’s Gold Foil Experiment Close-up Of Gold Foil Atoms Alpha Particles Hit Gold Atom Nucleus And Are Deflected

10 Chadwick Experimented with radioactivity Discovered the neutron
(1891 – 1974) Experimented with radioactivity Discovered the neutron

11 Done!

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