The Periodic Table
In 1869, Dimitri Mendeleev created the first periodic table. By organizing elements according to atomic numbers, new trends and properties were discovered. The periodic table contains trends that help describe atomic and molecular activity like electronegativity, electron affinity, and ionization energy, all of which can be used to understand how atoms work and interact. In this unit, you'll take a look at how these trends work and how the periodic table reveals entirely new worlds of chemistry. Follow Fiveable's study guides for a deeper look into periodic trends, groups, and elements!