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 ...

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 ...

6 Oganesson (Og) is the most recently added superheavy element (SHE) in the periodic table. It completes the seventh period and belongs to group 18 of the noble gases. So far, only five atoms of ...