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The noble gases in group 8 of the periodic table are used to demonstrate the impact of density on balloons filled with different gases. A balloon filled with helium rises quickly in air. At the bottom of the group, a balloon filled with xenon falls quickly.
This clip is from:
First broadcast:
20 March 2008

Classroom Ideas

This clip may work well as a supplement to demonstrations to show patterns in the chemistry of alkali metals and halogens carried out in the classroom. Discuss the noble gases’ lack of reactivity and possible reasons for this. Introduce the Octet Rule of Thumb.