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Quantity
1
Description
Cesium's atomic number is 55 and its symbol is Cs. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. It ignites...
Reviews
4.4
9 ratings
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Finally get to experience the most reactive metal and the least electronegative element from the safety of an acrylic cube (and its low melting point makes it fun to play with as a bonus)! The minor downside is that the cesium is only ~99% pure as some of it is stuck to the glass ampoule and can't come off no matter how many freezing and melting cycles I do (see photos). If it were 99.99+% pure it wouldn't stick to the glass and would've been more fun to play with.
C
Christopher · August 7, 2026
We’ve been waiting a long time for this cube, but it was worth it. As usual, the craftsmanship is beautiful, it looks very impressive, and the cesium is stunning. Just imagine—one of nature’s most reactive elements, enclosed in an acrylic cube! It’s simply amazing!