Periodic Table

According to Wikipedia, a periodic table is a tabular display of the chemical elements. Its invention is credited to the Russian chemist Dmitri Mendeleev in 1869, who intended the table to illustrate recurring ("periodic") trends in the properties of the elements. The layout of the table has been refined and extended over time, as new elements have been discovered, and new theoretical models have been developed to explain chemical behavior.

Back in HS, we were required to memorize the elements and its corresponding atomic number. In all fairness, we had fun doing it. We would have this contest, and mind you almost all of us could memorize the molecular weight of each of the element. Sound geeky? Oh well, we were trained to do that. That's why when we reached college, it was just easy for us to take Chemistry. In fact, I enjoyed our Chem 15 class. It was just tough because competition among classmates seemed annoying in college. I was so over the competition phase back then. I never thought of competing for grades purposes. Aha. I started being cynical about grades in College...
It was fun learning about these chemicals. It was also cool learning their properties and understanding their arrangement of (or the logic behind) the table.