Past
In the past I knew about how it had metals and non metals. I also knew it was catagorized by atomic number. I even knew that hydrogen is the first element. Lastly I knew that it has 9 rows and 18 columns.
Present
I know everything I used to know. I know now that Mendeleev invented it. I also know that 90 elements occur in nature. Lastly I know that technetium was the first man made element.
Future
I want to learn more about Mendeleev. I also want to learn about how he made it. I even want to know how scientists make new elements. Lastly I want to learn more about all the individual elements.
http://en.m.wikipedia.org/wiki/Periodic_table
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