The Periodic Table & Me
Periodic tables are essential in science, as they summarize and predict the properties of elements. Because periodic tables are still developing (not entirely accurate), it is important to study the history behind them.
By the late 1800s, scientists are well aware of the discovered elements. In 1869, a Russian chemist (MENDELEEV) developed the first periodic table by arranging the elements according to their atomic masses. He also predicted the discovery of other elements, and left empty spaces in his periodic table for them. Since then, there have been countless discoveries that led to further additions to Mendeleev's periodic table (radioactive elements, neutrons, protons, electrons). Then, in the early 1900s, Henry Moseley came up with a new way to arrange elements in the periodic table, which is by atomic numbers (based on the number of electrons) instead of atomic masses. And that's been used ever since.
Although ionic radii exhibit the same trends as atomic radii, ionic radii are still generally SMALLER.
MY ANALOGOUS PERIODIC TABLE
Our project was to create a poster that explains various periodic trends using anologies. I had to demonstrate the trends that ionic radii exhibit. The trend of ionic radii is that as you move across the periodic table from left to right, the radii of the elements decrease because of stronger nuclear charge (resulted from more protons [+] as you move across the table from left to right) pulling them closer to the nucleus. On my poster, this is shown by the decrease in prices as the years progress. Another trend is that as you go down a group, the radii increase because the number of electrons increase (more energy levels). I showed this on my poster by arranging the car models from smallest to largest (TOP -> BOTTOM).
