Copper has been used by humans for as much as 7000 years and elements such as gold, silver ... line in the diagram of the periodic table above separates the metals, on the left, from non-metals ...

118 Elements ... periodic table that we follow for our studies is the Modern Periodic Table, which is based on atomic number ...

This year we celebrate the 150 th anniversary of Mendeleev’s achievement in formulating the structure of the periodic table that we use today. He announced his structure in 1869, but the challenge of ...