7th Grade-Ch. 3 Sec. 2 Reading the Periodic Table
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7th Grade-Ch. 3 Sec. 2 Reading the Periodic Table

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7th Grade-Ch. 3 Sec. 2 Reading the Periodic Table 7th Grade-Ch. 3 Sec. 2 Reading the Periodic Table Presentation Transcript

  • Organizing the Elements Ch. 3 Sec. 2
  • Activity-Which is easier? Pg. 80 Your time (seconds) RANDOM ORDER Your time (seconds) ROWS
  • Why is the Periodic Table important to me?
    • most useful tool to a chemist
    • organizes lots of info. about all known elements
  • Pre-Periodic Table Chemistry …
    • … was a mess!!!
    • No organization of elements.
    • Imagine going to a grocery store with no organization!!
    • Difficult to find information.
    • Chemistry didn’t make sense.
  • Dmitri Mendeleev: Father of the Table
    • HOW HIS WORKED…
    • Put elements in rows by increasing atomic mass.
    • Put elements in columns by the way they reacted.
    • SOME PROBLEMS…
    • He left blank spaces for what he said were undiscovered elements. (Turned out he was right!)
    • He broke the pattern of increasing atomic weight to keep similar reacting elements together.
  •  
  • The Current Periodic Table
    • Mendeleev wasn’t too far off.
    • Now the elements are put in rows by increasing ATOMIC NUMBER!!
  • Each square of periodic table incl:
      • element’s atomic number = # of protons in its nucleus
      • chemical symbol
      • name
      • atomic mass = avg. mass of all isotopes of that element
    15.9994
  • Chemical symbol
    • 1 or 2 letters
    • ex : iron= Fe
  • Groups
    • columns
    • aka families
    • 18 groups
    • eg: Group 15= nitrogen family
    • each group has similar characteristics
  • Periods
    • Horizontal rows
    • 7 periods
  • Periodic Table Song by Tom Lehrer
  •  
  • YouTube video-Meet the Elements
    • Periodic Table Rap-YouTube
    • http:// www.youtube.com/watch?v = cAnOUwPfHlk&feature =related