Chemistry Chapter 2 Atoms and Molecules

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misol
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Chemistry Chapter 2 Atoms and Molecules
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2015-01-28 22:30:23
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sacco chemistry chapter 2
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  1. Daltons Atomic Theory (1800)
    • 1. Elements are made of atoms and same atoms are the same
    • 2. atoms are different from other atoms of different elements
    • 3. compounds have more than one element 
    • 4. atoms are not created or destroyed
  2. JJ Tompson
    after we found out electrons are negatively charged using cathode ray tube, he calculated the mass to mass of electron to be 1.76E8C/1g
  3. R.A Millikan
    measured electron charge to be 1.6022E-19C
  4. Rutherford
    • gold foil experiment. 
    • Finds out atoms are mostly empty space
    • positive charge in the nucleus (which is a dense core)
  5. mass of proton and neutron
    1.67E-24g
  6. Atomic Number (Z)
    # of proton (and electron if neutral atom) in an atom
  7. Atomic Mass (A)
    number of protons AND neutrons
  8. Nuclear Symbol
    • A    X  
    • Z    X
  9. Isotope
    atoms that have the same proton but different mass due to different neutron
  10. Average Atomic Mass
    • atomic mass (amu) = 1.66605378E-24g
    • 1 amu is 1/12 mass of carbon 12 atom
  11. Who organized current periodic table
    Dmitri Mendeleev
  12. Horizontal
    Vertical 
    Periodic table
    • horizontal - periods
    • vertical - groups
  13. Catagories
    • Metals
    • Nonmetals
    • Metalloids
  14. Metals
    • good conductors of heat and energy
    • Group 1A = alkali metals excluding H
    • Group 2A alkaline earth metals
    • Group 1B, 3B-8B = Transition metals
  15. Nonmetals
    • poor conductors of heat and energy
    • Group 6A = chalcogens
    • Group 7A = halogens
    • Group 8 A = noble gases
  16. Metalloids
    characteristics of metals and nonmentals
  17. Mole
    • 6.022E23
    • Arogadro's number

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