February 7 is National Periodic Table Day, when we celebrate the efforts of scientists over the centuries to figure out how different elements ...

The periodic table of elements (often known simply as the periodic table) has been helping scientists with their work for a little over 150 years. The handy visual reference guide organizes known ...

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 ...

Developing the periodic table The periodic table was developed by grouping elements with similar properties. This, together with a later arrangement by atomic weight, led to a repeating pattern of ...