History of the Atom. Democritus (400 BC) Proposed that matter was composed of tiny, invisible...
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![Page 1: History of the Atom. Democritus (400 BC) Proposed that matter was composed of tiny, invisible particles. Gr. atomos.](https://reader036.fdocuments.net/reader036/viewer/2022081503/5a4d1b527f8b9ab0599a7e7e/html5/thumbnails/1.jpg)
History of the Atom
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Democritus (400 BC)
• Proposed that matter was composed of tiny, invisible particles.
• Gr. atomos
![Page 3: History of the Atom. Democritus (400 BC) Proposed that matter was composed of tiny, invisible particles. Gr. atomos.](https://reader036.fdocuments.net/reader036/viewer/2022081503/5a4d1b527f8b9ab0599a7e7e/html5/thumbnails/3.jpg)
Aristotle
• Said that all substances are composed of four elements: Earth, Wind, Fire, and Water.
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John Dalton (1803 AD)• the first coherent atomic theory
• Matter is composed of small particles called atoms.
• All atoms of an element are identical.
• During chemical reactions, atoms are neither created nor destroyed, but are simply rearranged.
![Page 5: History of the Atom. Democritus (400 BC) Proposed that matter was composed of tiny, invisible particles. Gr. atomos.](https://reader036.fdocuments.net/reader036/viewer/2022081503/5a4d1b527f8b9ab0599a7e7e/html5/thumbnails/5.jpg)
J.J. Thompson (1897 AD)
• Used cathode rays to calculate the atomic mass of atoms.
![Page 6: History of the Atom. Democritus (400 BC) Proposed that matter was composed of tiny, invisible particles. Gr. atomos.](https://reader036.fdocuments.net/reader036/viewer/2022081503/5a4d1b527f8b9ab0599a7e7e/html5/thumbnails/6.jpg)
Cathode Ray Tube Experiment
![Page 7: History of the Atom. Democritus (400 BC) Proposed that matter was composed of tiny, invisible particles. Gr. atomos.](https://reader036.fdocuments.net/reader036/viewer/2022081503/5a4d1b527f8b9ab0599a7e7e/html5/thumbnails/7.jpg)
Ernest Rutherford (1910 AD)
• alpha particles (He nuclei) were shot at a thin piece of gold foil.
• most of the particles passed through the foil with little or no deflection, some were deflected to a great degree.
![Page 8: History of the Atom. Democritus (400 BC) Proposed that matter was composed of tiny, invisible particles. Gr. atomos.](https://reader036.fdocuments.net/reader036/viewer/2022081503/5a4d1b527f8b9ab0599a7e7e/html5/thumbnails/8.jpg)
Gold Foil Experiment
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Isotopes
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Radioactive Decay
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C14 Decay
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Carbon Dating
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Carbon Dating VideoClick on the picture above to view.