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500 BCE
The Alchemists
Discovered a substance that could transmute common metals to more valuable metals and the start leading to The Periodic Table Of Elements. uwaterloo.ca/chem13-news-magizine/febuary-2019/feature/ancients-and-alchemists https://www.bulbapp.com/u/atomic-model-timeline~2 -
430 BCE
Democritus
The theory that atoms are uniform, solid, hard, incompressible, and indestructible britannica.com/science/atom/Development-of-atomic-theory https://www.bulbapp.com/u/atomic-model-timeline~2 -
428 BCE
Plato
The theory of elements and how they make up matter https://www.bulbapp.com/u/atomic-model-timeline~2 abyss.uoregon.edu -
Robert Boyle
Discussed the idea of atoms existing, How everything matter is made up of atoms -
Antone Lavoisier
Discovered the total mass is the same and never brakes (Conservation of Mass) Breakingatom.com -
Billiard Ball Model
Created by John Dalton when he made the theory of the solid sphere otherwise known as Billiard ball https://www.bulbapp.com/u/atomic-model-timeline~2 -
John Dalton
Proposed the idea that compounds were atoms combined together courses.lumenlearning.com https://www.bulbapp.com/u/atomic-model-timeline~2 -
Amedeo Avogradro
Discovered that equal volumes of gasses at the same temperature and pressure contain equal numbers of molecules Sciencehistory.org -
Dmitri Mendeleev
Discovered when chemicals are arranged in their atomic numbers a pattern starts to form and made the first periodic table of elements Britannica.com/biography/Dmitri-Mendeleev https://www.bulbapp.com/u/atomic-model-timeline~2 -
JJ Thompson
He determined the charge to mass ratio of the Electron https://www.bulbapp.com/u/atomic-model-timeline~2 -
Pierre and Marie Curie
Discovered radioactive elements polonium and radium and studied other radioactive elements Britannica.com/science/atom/Discovery-of-Radioactivity -
Ernest Rutherford
Discovered that atoms consist mostly of empty space. Britannica.com/biography/Ernest-Rutherford -
Plum Pudding Model
Created by William Thompson who believed that the atom was made up of multiple negative and positive charges https://www.britannica.com/science/Thomson-atomic-model -
Albert Einstein
Confirmed the existence of the atom is true ans.org -
Robert Millikan
Discovered fundamental electric charge otherwise known as the charge of an electron cources.lumenlearning.com https://www.bulbapp.com/u/atomic-model-timeline~2 -
Solar System Model
Created by Ernest Rutherford, He believed that the solar system looked like this https://www.bulbapp.com/u/atomic-model-timeline~2 -
Neils Bohr
Proposed Hydrogen Atom and how there could be more electrons moving around the outer ring orbiting the nucleus. nobelprize.org/prizes/physics/1922/bohr/facts/ https://www.bulbapp.com/u/atomic-model-timeline~2 -
Henry G. J. Mosely
Discovered the atomic number otherwise know as how many positive charges in nucleus Britannica.com/biography/Henry-Mosely -
Erwin Schodinger
Proposed the quantum mechanical model of the atom, which treats electrons as matter waves -
Electron Cloud Model
Created by Neil Bohr is a model of an atom which consists of a nucleus and a rapidly fast moving electrons surrounding it. nuclear-power.com -
Werner Heisenburg
Made the Uncertainty Principle stating we cannot know the exact location of a particle -
James Chadwich
Discovered the Neutron abcte.org
