R.A.+Atomic+Models

__**//Atomic Models://**__ **__ ﻿The Ancient Greek Model: __** The idea that matter is made of small, "indivisible pieces" has been around for thousands of years.



**__ The Plum Pudding Model: __** 1906, J.J. Thomson created a current of "Negatively Charged Particles" in a "cathode-ray" tube that were much smaller than an atom.



**__ Rutherford's Model: __** 1908, Ernest Rutherford discovered that the center of the atom is densely packed and positively charged.



**__ Bohr's Model: __** In 1913, Neils Bohr introduced quantum mechanics into the atomic model.



**__ Schroedinger's Model: __** A powerful model of the atom was developed by Erwin Schrödinger in 1926.