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Periodic  Table  C P
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Periodic Table C P

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  • 1.  
  • 2. The History
    • Dobereiner
      • Found elements could be put in Triads
    • Grouped By Similar Chemical Properties
    • Many Properties of Middle Elements Are Approximate Averages Of The Properties Of The 1 st And 3 rd Element
  • 3. Example of Triads
    • ELEMT ATOMIC MASS Density
    • Cl 39.5 1.56
    • Br 79.9 3.12
    • L 126.9 4.95
  • 4. J.A.R. Newlands (1837-1898)
    • Presented the idea that when the elements were arranged in order of increasing atomic mass, the properties of every eighth element was like that of the first in the set:1 st -8 th , 2 nd -9 th , and so on
    • Called the pattern the law of octaves
  • 5. Dmitri Mendeleev (1834-1907) Lothar Myer (1830-1895)
    • Published nearly identical schemes for classifying the elements
    • Mendeleev is given more credit since he published first and was more successful at demonstrating it
    • Mendeleev also put breaks in the Table where other elements were yet to be found b/c he knew they had to fit in to make the table work right
  • 6. Mendeleev
    • Wanted to make the elements easier to learn and understand
    • Placed elements using their properties
    • When arranged the elements by increasing atomic mass, could see a periodic repetition of their properties
    • Used this to create the first Periodic Table
  • 7. The History (Cont.)
    • Moseley
      • Developed atomic number concept for the atom
      • Arranged elements by increasing atomic number rather than mass as Mendeleev had
  • 8. The Periodic Law
    • States that: When elements are arranged in order of increasing atomic number, their physical and chemical properties show a periodic pattern.

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