Big Ideas about the Periodic Table of Elements

1. Dmitri Mendeleyev created the Periodic Table of Elements
2. He did this by putting the elements on cards and rearranging them til he found an arrangement that worked.  He organized them by putting like elements next to each other in rows (periods) and columns (groups).
3. This created gaps in the Periodic Table which showed elements that were (at the time) yet to be discovered.