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? <ul><li>most useful tool to a chemist </li></ul><ul><li>organizes lots of info....
Pre-Periodic Table Chemistry … <ul><li>… was a mess!!! </li></ul><ul><li>No organization of elements. </li></ul><ul><li>Im...
Dmitri Mendeleev: Father of the Table <ul><li>HOW HIS WORKED… </li></ul><ul><li>Put elements in rows by increasing atomic ...
 
The Current Periodic Table <ul><li>Mendeleev wasn’t too far off. </li></ul><ul><li>Now the elements are put in rows by inc...
Each square of periodic table incl: <ul><ul><li>element’s  atomic number = # of protons in its nucleus </li></ul></ul><ul>...
Chemical symbol <ul><li>1 or 2 letters </li></ul><ul><li>ex : iron= Fe </li></ul>
Groups <ul><li>columns  </li></ul><ul><li>aka families </li></ul><ul><li>18 groups </li></ul><ul><li>eg: Group 15= nitroge...
Periods <ul><li>Horizontal rows </li></ul><ul><li>7 periods </li></ul>
Periodic Table Song by Tom Lehrer
 
YouTube video-Meet the Elements <ul><li>Periodic Table Rap-YouTube </li></ul><ul><li>http:// www.youtube.com/watch?v = cAn...
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8th Grade-Ch. 3 Sec. 2 Reading the Periodic Table

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8th Grade-Ch. 3 Sec. 2 Reading the Periodic Table

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