The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

Students look more deeply into the structure of the atom and play a game to better understand the relationship between protons, neutrons, electrons, and energy levels in atoms and their location in ...

In these chapter notes all important topics related to Classification & Periodicity in Properties like need to classify elements, Law of Triads, Law of Octaves, Mendeleev's Periodic Table ...