Periodic Table

Past: Before I watched this video I knew that Dmitri Mendaleeve had some part in helping make the Periodic Table. The table also was separated into different groups/columns. Ordered by Atomic Number. Metal and gasses are in different groups.

Present: I learned that you can combine elements and make new elements. I learned that Chlorine was used as a weapon. But now it's used for pools. There are man made atoms.

Future: I liked the part of the video where they talked about Chlorine and how it was used as a weapon. I'd like to learn more about gold. 

Cite: http://pixabay.com/en/bullions-commodity-investment-154931/