The noble gases become heavier as you go down the column of the Periodic Table. Helium is the smallest molecule; xenon is the largest. What would you expect to happen as you filled balloons with each gas?
Do your own research too. Find out an interesting detail to share about the gases; anything about neon, argon, krypton, radon, xenon, helium?
Watch this video. And this. Could you ascribe a character to each of these elements? Maybe you could make a family from them. (The mother is the brilliant and pleasant character, obviously.)
Find out something new to you too, and share your knowledge, about these non-metals: carbon, nitrogen, oxygen, phosphorous, sulfur, selenium.
You've now seen several chemists demonstrating the properties of liquid nitrogen. You could key liquid nitrogen experiments into Youtube and see what you can find.
Here's one video, with an interesting side discussion on handling liquid nitrogen - I recall seeing chemists handling it very quickly, and have had to assume they are experienced in what they do, which is why their fingers don't immediately freeze.
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