Watch to the end for the best (Cesium!)! A wonderful representation of the alkali metals and their accurate reactivity with water. unlike brainiac, who did infact use explosives in their episode for rubidium and cesium. Very worth a watch.
All credit for this video goes to the makers of physical science, and openlearn.open.ac.uk. Link here:
http://openlearn.open.ac.uk/mod/resource/view.php?id=294420
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