Scale Model of the Atom http://www.phrenopolis.com/perspective/atom/
Rutherford's Gold Leaf Experiment http://www.clickandlearn.org/Gr9_Sci/atoms/rutherford.html
Reaction of Alkali Metals & Water (including Rubidium and Cesium!) http://www.teachertube.com/view_video.php?viewkey=c8cfbba760be3f23083b