Reactions of Alkali Metals with Water

This YouTube video shows reactions of the alkali metals lithium, sodium, potassium, rubidium, and cesium with water. After seeing this, you'll know why the Group I elements are called the "active" metals. Another video, a little on the nutty side but entertaining, is at http://www.youtube.com/watch?v=cqeVEFFzz7E. Don't try this at home!