1) Models of atom: http://www.youtube.com/watch?v=NSAgLvKOPLQ

 

2) Isotopes: http://www.youtube.com/watch?v=EboWeWmh5Pg

 

3) To build your own atoms: phet.colorado.edu/en/simulation/build-an-atom

 

4) To find weighted average: http://www.youtube.com/watch?v=slFqL86q3EA

                                                     http://youtu.be/6CfSyGd5Ry4

 

5) Rutherford model : http://www.youtube.com/watch?v=dNp-vP17asI

 

6) Bonding: http://www.youtube.com/watch?v=8u1hlz_XdGU

 

7) Arranging electrons: http://youtu.be/-jrYmggqQBk

 

8) Isotopes: http://youtu.be/IG9VZU086QY