The Periodic Table is an arrangement of chemical [[elements]] first developed by [[Russia|Russian]] [[chemistry|chemist]] [[Dimitri Mendeleev]]. Its layout accurately arranges elements by their [[electron]] configuration, atomic number, and chemical properties. | The Periodic Table is an arrangement of chemical [[elements]] first developed by [[Russia|Russian]] [[chemistry|chemist]] [[Dimitri Mendeleev]]. Its layout accurately arranges elements by their [[electron]] configuration, atomic number, and chemical properties. |