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 ...

During the process, they discovered something unexpected about this particular f-block element on the periodic table that could ... is that it has a tetravalent oxidation state (a positive charge ...

Scientists have found that our bodies need 28 different elements to function properly. These are almost one-quarter of the periodic table and are mainly found in the first four periods.