-
400 BCE
Democritus
Key member of the Atomist Doctrine.
(https://plato.stanford.edu/entries/democritus/) -
400 BCE
Plato
Believed that atoms formed in shapes and figures
(https://plato.stanford.edu/entries/atomism-ancient/#PlatPlat) -
100 BCE
Alchemists
They were the first to understand the atom and how it was composed. (https://healthresearchfunding.org/alchemists-atomic-theory-explained/) -
-
Antoine Lavoisier
Created the Law of Conservation of Mass (https://www.britannica.com/science/conservation-of-mass) -
John Dalton
Proposed that the atom was the smallest particle of matter. (https://www.breakingatom.com/glossary-of-terms/john-dalton)
(https://www.britannica.com/biography/John-Dalton) -
Billiard Ball Model
Created by John Dalton. Consists of a singular dense, hard core.
(https://www.ck12.org/chemistry/daltons-atomic-theory/lesson/Daltons-Atomic-Theory-MS-PS/) -
Dmitri Mendeleev
Created the first periodic table structure.
(https://www.breakingatom.com/glossary-of-terms/dimitri-mendeleev) -
-
Plum Pudding Model
Created by JJ Thomson. Showed that it was an area of positive charge surrounding the electrons.
(https://www.breakingatom.com/learn-the-periodic-table/the-history-of-the-atomic-model-thomson-and-the-plum-pudding) -
Pierre and Marie Curie
Discovered the elements radium(Ra) and polonium(Po).
(https://www.britannica.com/science/polonium)
(https://www.britannica.com/biography/Pierre-Curie) -
Albert Einstein
Mathematically proved the existence of atoms (https://www.ans.org/news/article-969/albert-einstein-and-the-most-elemental-atomic-) -
Robert Millikan
He discovered the charge of electrons.
(https://www.britannica.com/biography/Robert-Millikan) -
Ernest Rutherford
Created the Rutherford atomic model
(https://www.britannica.com/science/Rutherford-model) -
Solar System Model
Created by Ernest Rutherford. Consists of a positively charges core surrounded by negative electrons like how the planets are to the sun
(https://www.britannica.com/science/Rutherford-model) -
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Henry G. J. Moseley
Created Moseley's Law and the atomic number system.
(https://www.britannica.com/science/Moseleys-law) -
Erwin Schrödinger
Enhanced and improved upon the Bohr atomic model.
(http://www.abcte.org/files/previews/chemistry/s1_p6.html) -
Electron Cloud Model
Created by Erwin Schrödinger. Has a dense nucleus surrounded by multiple electron orbits.
(https://www.msnucleus.org/membership/html/jh/physical/atomictheory/lesson1/atomic1g.html) -
James Chadwick
He discovered the neutron
(https://www.breakingatom.com/learn-the-periodic-table/the-history-of-the-atomic-model-chadwick-and-the-neutron)
