This video explains the periodic table, containing all the known elements arranged in groups and periods. Elements in the same group of the periodic table show trends in physical properties ...

The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...

This video is about the mole, the unit of measurement for the number of particles in a substance. How to titrate an acid and an alkali VideoHow to titrate an acid and an alkali A video with ...