VALENCE ELECTRONS AND THE PERIODIC TABLE

1. http://www.youtube.com/watch?1TZA171yxY4&feature=SeriesPlayList&p=166048DD75B05C0D&index=51TZA171yxY4&feature=SeriesPlayList&p=166048DD75B05C0D&index=5

2. http://www.youtube.com/watch?v=LDHg7Vgzses&feature=SeriesPlayList&p=166048DD75B05C0D&index=6

3. http://www.youtube.com/watch?v=ywqg9PorTAw&feature=SeriesPlayList&p=166048DD75B05C0D&index=7

4. http://www.youtube.com/watch?v=XMLd-O6PgVs&feature=SeriesPlayList&p=166048DD75B05C0D&index=8

5. Ionic and covalent bonds:
http://www.youtube.com/watch?v=CGA8sRwqIFg&feature=SeriesPlayList&p=166048DD75B05C0D&index=9