The terms theory and model are defined, and students learn how a theory remains valid. Atomic Theory: The Development of the Atomic Theory: The terms theory and model are defined, and students learn ...

Once a baffling theory, quantum mechanics has evolved into a driving force behind modern technology and frontier research.

Jennifer Rampling is assistant professor of history at Princeton University in New Jersey, where she teaches the history of early modern science. More than two millennia before the periodic table was ...

THE beautiful conception which inspires and co-ordinates practically the whole of modern atomic physics is the atomic model of Rutherford and Bohr. Its essential feature-the nucleus-was first put ...