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The Atomic Theory

The Atomic Theory. The Thinker. By: Bujana Mulosmani, Christopher Perez and Samuel Rodriguez. Aristotle and Democritus. Who : Aristotle When : More than 2,000 years ago Where : Greece What : Aristotle believed in 4 elements: Earth, Air, Fire, and Water

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The Atomic Theory

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  1. The Atomic Theory The Thinker By: Bujana Mulosmani, Christopher Perez and Samuel Rodriguez

  2. Aristotle and Democritus Who: Aristotle When: More than 2,000 years ago Where: Greece What: Aristotle believed in 4 elements: Earth, Air, Fire, and Water Why: Aristotle used observation and inference to explain the existence of everything Who: Democritus When: More than 2,000 years ago Where: Greece What: Democritus believed hat matter was made with small particles (atoms) Why: Democritus used observation an inference to explain the existence of everything

  3. Alchemists Who: European Scientists When: 800 – 900 years ago Where: Europe What: Their work developed into what is now modern chemistry Why: They were trying to changes ordinary materials into gold

  4. Atomic Particle Theory Who: John Dalton When: 1808 Where: England What: He describes atoms as tiny particles than cannot be divided. He thought that each element was made of its own atom. The “Atomic Theory” was developed. Why: He was building on the ideas of Democritus in ancient Greece

  5. Dalton’s Atomic Theory Elements are composed of small indivisible particles(atoms). Atoms of the same element are identical. Atoms of different elements are different. Atoms of different elements combine together in simple properties to create compounds. In chemical reaction, atoms are rearranged, but not changed.

  6. Discovery of Electrons Who: J.J. Thompson When: 1897 Where: England What: Thompson discovered that electrons are even smaller particles of an atom and were negatively changed Why: Thompson knew atoms were neutrally charged, but couldn’t find the positive particle

  7. Who: Ernest Rutherford When: 1911 Where: England What: He conducted an experiment to isolate the positive particles in an atom. He then decided that the atoms were mostly empty space, but had a dense central core. (Gold foil exp.) Why: He knew that atoms have negative and positive particles, but could not decide how they were arranged. Atomic Structure PartI Gold Foil Experiment

  8. Atomic Structure Part II Who: Neils Bohr When: 1913 Where: England What: Proposed that electrons travel in fixed paths around the nucleus. Scientists still use the Bohr model to show the number of electrons in each orbits around the nucleus. Why: Bohr was trying to show why the negative electrons were not sucked into the nucleus of the atom.

  9. Electron Cloud Model • Electrons travel the nucleus in random orbits • Scientist can not predict where they will be going at any given moment • Electrons travel so fast, they appear to form “ cloud “ around the nucleus.

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