Discover the history, structure, and importance of the periodic table of elements, from Mendeleev’s discovery to modern scientific applications. When you purchase through links on our site, we may ...

the number of circles in the electronic configuration of an element is represented in the periodic table as the period number that element is situated in the number of electrons in the outermost shell ...

Every field of science has its favorite anniversary. For physics, it’s Newton’s Principia of 1687, the book that introduced the laws of motion and gravity. Biology celebrates Darwin’s On the Origin of ...

One of the nice things about the Internet is that you don’t need huge reference books anymore. You really don’t need big wall charts, either. A case in point: what science classroom didn’t have a ...