Atom

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Atom

  1. 1. Atomic Structure<br />
  2. 2. I. Electrical Charges<br />Repel<br />Same charges (+ to +) or (- to -)<br />Attraction<br />Opposites (+ to -)<br />
  3. 3. II. History of Chemistry<br />Early Greek Elements<br />Earth, Fire, Air, Water<br />
  4. 4. II. History of Chemistry<br />Democritus (~400 BC)<br />Smallest matter is an atom<br />
  5. 5. II. History of Chemistry<br />Alchemists (Middle Ages)<br />Trying to make Gold<br />
  6. 6. II. History of Chemistry<br />John Dalton (1808)<br />Atom are small spheres (marble)<br />Elements made of unchangeable atoms<br />Compound have specific ratios of atoms<br />
  7. 7. 74<br />
  8. 8. 74<br />
  9. 9. II. History of Chemistry<br />J. J. Thompson (1897)<br />Atoms have parts<br />
  10. 10. II. History of Chemistry<br />Earnest Rutherford (1911)<br />Atom’s mass in the center (1:10,000)<br />
  11. 11. II. History of Chemistry<br />Neil Bohr (1913)<br />Negative charges orbit dense center<br />
  12. 12. III. Structure of the Atom<br />Particles inside the atom<br />Proton<br />Neutron<br />Electron<br />75<br />
  13. 13. III. Structure of the Atom<br />How are they different? (1.67 x 10-24g)<br />1<br />+1<br />1<br />0<br />0.0005<br />-1<br />
  14. 14. III. Structure of the Atom<br />Shells<br />e<br />C. Location inside the atom<br />Nucleus<br />p & n<br />75<br />
  15. 15. III. Structure of the Atom<br />D. Terminology<br />Atomic Number = # p<br />Element name<br />On table: Top of each box<br />By hand: Bottom Left<br />Atomic Weight = # p + # n<br />On table: Bottom of each box<br />By hand: Top Left<br />
  16. 16. III. Structure of the Atom<br />D. Terminology<br />Atomic Weight = # p + # n<br />Every new weight = Isotope<br />78<br />
  17. 17. III. Structure of the Atom<br />+2<br />11<br />C<br />6<br />D. Terminology<br />Charge<br />Determined by amount of electrons<br />p – e = Charge<br />Written in top right corner<br />On Table: ALWAYS NO CHARGE<br />

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