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Ch. 3 Sec.  2Organizing theElements
Activity-Which is easier? Pg. 80Your time (seconds)   Your time (seconds)RANDOM ORDER                ROWS
Why is the PeriodicTable important to me?          most useful tool           to a chemist          organizes lots of   ...
Pre-Periodic Table Chemistry …   …was a mess!!!   No organization of elements.   Imagine going to a grocery    store wi...
Dmitri Mendeleev: Father of the Table      HOW HIS                    SOME      WORKED…                    PROBLEMS…     ...
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 sy...
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 theElements   Periodic Table Rap-YouTube   http://www.youtube.com/watch?    v=cAnOUwPfHlk&feature=rel...
7th grade ch. 3 sec. 2 reading the periodic table
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

  1. 1. Ch. 3 Sec. 2Organizing theElements
  2. 2. Activity-Which is easier? Pg. 80Your time (seconds) Your time (seconds)RANDOM ORDER ROWS
  3. 3. Why is the PeriodicTable important to me?  most useful tool to a chemist  organizes lots of info. about all known elements
  4. 4. 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.
  5. 5. Dmitri Mendeleev: Father of the Table HOW HIS SOME WORKED… PROBLEMS…  Put elements in rows  He left blank spaces by increasing atomic for what he said were mass. undiscovered elements. (Turned  Put elements in out he was right!) columns by the way  He broke the pattern they reacted. of increasing atomic weight to keep similar reacting elements together.
  6. 6. The Current Periodic Table Mendeleev wasn’t too far off. Now the elements are put in rows by increasing ATOMIC NUMBER!!
  7. 7. 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
  8. 8. Chemical symbol 1 or 2 letters ex: iron= Fe
  9. 9. Groups columns aka families 18 groups eg: Group 15= nitrogen family each group has similar characteristics
  10. 10. Periods Horizontal rows 7 periods
  11. 11. Periodic Table Song by Tom Lehrer
  12. 12. YouTube video-Meet theElements Periodic Table Rap-YouTube http://www.youtube.com/watch? v=cAnOUwPfHlk&feature=related

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