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### Transcript

• 1. Organizing the Elements Ch. 3 Sec. 2
• 2. Activity-Which is easier? Pg. 80 Your time (seconds) RANDOM ORDER Your time (seconds) ROWS
• 3. Why is the Periodic Table important to me?
• most useful tool to a chemist
• organizes lots of info. about all known elements
• 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. 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.
• 6.
• 7. The Current Periodic Table
• Mendeleev wasn’t too far off.
• Now the elements are put in rows by increasing ATOMIC NUMBER!!
• 8. 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
• 9. Chemical symbol
• 1 or 2 letters
• ex : iron= Fe
• 10. Groups
• columns
• aka families
• 18 groups
• eg: Group 15= nitrogen family
• each group has similar characteristics
• 11. Periods
• Horizontal rows
• 7 periods
• 12. Periodic Table Song by Tom Lehrer
• 13.
• 14. YouTube video-Meet the Elements