This is one of my favorite science videos I have ever seen. As PBS's NOVA goes, I am a big Neil DeGrasse Tyson fan, but David Pogue does a great job exploring the periodic table and how it describes the different things that make up our world.
He goes over how microscopic amounts of gold are gathered from the earth, as well as exploring how the Periodic Table works and why different elements are placed on it the way they are.
The link below takes you to the entire episode which is about two hours long, but it is broken into segments you can use to watch it in smaller chunks. It is well worht the time and a great resource to share with students of almost all ages.
NOVA: Hunting the Elements
I have also embedded the introduction to the episode below in case you want to check it out. Enjoy!
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