Cesium
Cs
Cesium is one of the most explosive and reactive alkaline metals, second only to Francium, which is radioactive. It's atomic number is 55, and atomic weight is 132 atomic mass units. It can be cut with your average knife because it is the softest metal ever discovered. It's color is either gold or silver.
It was discovered in 1860 by Robert Bunsen and Gustov Kirchhoff in Germany. Its melting point is 28 degrees Celsius, making it one of the few metals that are liquid at room temperature. This is extremely expensive and hard to find. It is usually found in small amounts but even that can make a boom.
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