Krypton - Periodic Table of Videos
The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about krypton -- element number 36 in the periodic table and the fourth noble gas.
Krypton gas is sometimes used to fill the space between the glass in double-glazed windows. Krypton gas has a low thermal conductivity because of the weight of its atoms.