Periodic Table Chemistry Semester Review
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- Over this semester, I learned many interesting things in Chemistry. One of my favorite units was about the Periodic Table. How it works is just so cool to me; the way everything comes together is quite interesting.
- To start, the periodic table was made by multiple scientists over the course of a century! Russian Chemist Dmitri Mendeleev is considered to be the father of the periodic table, however, as he found that the known elements at the time had a repeating pattern. He also predicted the properties of missing elements based on his table. Even so, It was British Scientist Henry Moseley that would discover how the elements should be arranged.
- Today, the periodic table is defined as a table that lists all known elements by increasing atomic number. Atomic number is a value assigned to an element based on the amount of protons in an element. Along with Atomic Number, elements are grouped into categories, such as metals, non-metals, and metalloids. Each category has its own characteristics, with metal having conductivity for example.
- The periodic table is also grouped by groups and periods, which are the rows and columns made inside the table. The rows and columns can help identify changes in valence electrons and in energy levels.
- But what are valence electrons and energy levels? The energy level is a diagram that gives us a way to show what energy the electron has. Valence electrons are the electrons on the outermost energy levels in an atom.
- But what about the elements themselves? Every element is capable of bonding with another, with there being ionic, covalent, and metallic bonds, each of which has its own properties. But there is one final aspect from this unit I need to cover, Ions and Isotopes.
- Ions are atoms with a change in the number of electrons, whereas Isotopes are atoms with the number of neutrons changed. They are still the same element as their original counterpart but are a variation. And that covers it! This unit was one of my favorites, as the ways everything came together were just so intriguing to me. I
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