I remember back in my school days, in science class, the great fun that was had experimenting with unstable elements. Included in our fun was Lithium (Li), Sodium (Na), and Potassium (K) – expressed in order of instability. Sadly we were never allowed any Cesium (Cs). 🙂 Anyway, some guy out there in internet world has put up some videos and text of his experiments with Sodium, well worth a look. source: Sodium Party. Credit where credit is due, I poached the link from Boing Boing