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not as exciting as you might think

Atomic People!. not as exciting as you might think. DEMOCRITUS. Greek philosopher who thought everything was made of small particles (atoms) 400 BC (2,400 years ago!). John Dalton. 1803 English chemist who developed the ATOMIC THEORY The Atomic Theory has 4 main points….

maggie-marquez
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not as exciting as you might think

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  1. Atomic People! not as exciting as you might think

  2. DEMOCRITUS • Greek philosopher who thought everything was made of small particles (atoms) • 400 BC (2,400 years ago!)

  3. John Dalton • 1803 • English chemist who developed the ATOMIC THEORY • The Atomic Theory has 4 main points…

  4. Atomic Theorypart 1 • All elements are composed of atoms which are indivisible and indestructable.

  5. Atomic Theorypart 2 • All atoms of the same element are exactly the same. Na Na

  6. Atomic Theorypart 3 • Atoms of different elements are different. Cl Na

  7. Atomic Theorypart 4 • Compounds are two(2) or more elements. Na Cl

  8. J.J. Thomson Positive “pudding” • 1897 • English scientist formed the “Plum Pudding Model” • The P.P. was a model showing positive and negative particles spread evenly throughout the atom. Negative “plums”

  9. Ernest Rutherford • 1908 • Stated that the atom has a nucleus with a positive charge (proton), and outside the nucleus there is a negative charge (electron) • Gold Foil experiment

  10. Au Foil Experiment Radioactive source in block Lead plate Au ZnS screen What Happened?

  11. Au foil continue Majority hit Straight through Small number hit Au In front of Au Small number hit Through but at angles

  12. What does it mean??? Have a Solid Nucleus, that is Small. Atom is Mainly empty space Nucleus is a charged Mass.

  13. Niels Bohr • 1913 • Stated that energy levels exist outside the nucleus, and the negative particles (electrons) went around the nucleus like the planets around the sun.

  14. New Wave Model • Came from Bohr’s model • Electrons travel in areas (called electron clouds) around the nucleus, not specific orbits.

  15. QUIZ • Who invented the plum pudding model? • What did the plums represent? • Who was the Greek? • How does the new wave model differ from Bohr’s? • Name the 4 parts of the Atomic theory: • Who invented the atomic theory?

  16. Tarea • Worksheet • Watch out, it has a back • Check out the website

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