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 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 ...

PRESENTER:'This is the Pearl River, 'and this is the great city of Guangzhou, 'what the Europeans call Canton. PRESENTER:And it was here, in the mid-1700s, that the destinies of China and the ...