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AP Chemistry - 
 
    Here's a link for some very helpful AP Chem videos: 
http://http//www.bozemanscience.com/ap-chemistry/


Here's a link to a great interactive Periodic Table:  http://acswebcontent.acs.org/games/pt.html


Here's a link to another great Periodic Table with ionization energies and more: 

http://www.ptable.com/#Property/Ionization