chemistry

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Author:
Mkuenle
ID:
55679
Filename:
chemistry
Updated:
2010-12-13 18:05:58
Tags:
Periodic Table
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Description:
CH.6
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  1. elements known since prehistoric times
    Au, Ag
  2. industrial revolution, 1870 over ___ elements were known
    70
  3. Dobereiner
    found trios of elements with similar properties.
  4. John Newlands
    arranged elements by atomic weight and found that similar elements appeared to be 7 elements apart; "Law of Octaves"
  5. Periodic
    pattern repeats in a specific manner
  6. Meyer
    Organized elements, but no attempts at predictions.
  7. Mendeleev
    • -organized periodic table
    • -arranged in increasing atomic mass
    • -predicted existence of 3 missing elements; Sc, Ga, and Ge
  8. Moseley
    • determined atomic numbers of the known elements and rearranged the periodic table.
    • -put elements in order of atomic number not mass
  9. the periodic table
    the repetition of chemical and physical properties of elements when they arranged by increasing atomic number
  10. elements with atomic number greater than 92 are ________
    synthetic
  11. ____ make up most of the elements of the periodic table
    metals
  12. found in famalies 13-18
    non-metals
  13. characteristics of both metals and non-metals
    metalloids
  14. atoms in the same group have similar properties because..
    same # of valence electrons
  15. energy level of an elements valence electron indicates...
    the period on the periodic table
  16. valence electrons are the main source for..
    elemental properties
  17. s-block elements
    • -hold 2 electrons
    • -very active metals
  18. representative elements
    • -group 1A-8A
    • -display a large range of chemical and physical properties
  19. hydrogen
    • group 1, 1 valence electron

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