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(AKA The Dead Dudes of Atomic Theory)

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1 (AKA The Dead Dudes of Atomic Theory)
Atomic Timeline (AKA The Dead Dudes of Atomic Theory)

2 Democritus 460 – 370 BC First to develop the idea that matter was made of particles called Atoms The term “Atoms” comes from the Greek word “atomos” which means “undivisible”

3 John Dalton 1766-1844 Proposed atomic theory
An atom is indivisible, indestructible, tiny sphere. Determined that elements have unique atomic masses

4 Joseph John Thomson 1856- 1940 Discovered Electrons
Proposed an atomic model known as the “plum pudding” model

5 Ernest Rutherford Discovered positively charged nucleus by probing atoms of gold foil with positively charged particles. Proposed atomic model with massive nucleus with electrons in a circle around it in a solar system model

6 Niels Bohr Developed atomic model that placed electrons in specific energy levels to explain why they did not spiral toward and collide with the nucleus Proposed the model with electrons in specific orbits around the nucleus

7 James Chadwick Discovered neutron as a neutral particle in the nucleus The discovery explained why the mass of an atom could not be attributed entirely to the mass of the protons (+) Positive Protons (0) Neutral Neutrons Nucleus

8 Erwin Schrodinger – 1933 Described electrons as waves with their probable location viewed as a cloud and introduced a mathematical model of the atom e-

9 Highlights Democritus First – Atomos - Indivisible John Dalton
Atomic Theory J.J. Thomson Electrons - “Plum Pudding” R.A. Millikan Charge and Mass of Electron Ernest Rutherford + Charged Nucleus – Gold Foil Niels Bohr Electrons Specific NRG Levels Erwin Schrodinger Electron Cloud Wave James Chadwick Neutrons (Jimmy Neutron)

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