Caesium or Cesium - Periodic Table of Videos
The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. Here are five grams of caesium in water... but did you know caesium is also used to define the length of a second?
Additional Resources for you to Explore
As we saw with xenon, caesium “thrusters” can be used to steer satellites in space.