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The Alchemists broke down the chemical composition of the 4 elements of fire, water, earth, and wind. https://healthresearchfunding.org/alchemists-atomic-theory-explained/ -
Democritus helped expand on the atomic theory that his mentor Leucippus had proposed. He also created the first model for the atom. https://atomictheorytimelineofscientists.weebly.com/democritus.html https://www.thehistoryville.com/atomic-theory-democritus-schrodinger/#:~:text=Democritus%20created%20the%20first%20atomic%20model%20%28a%20round,science%20of%20the%20atom%20and%20its%20generic%20makeup. -
Plato introduced his own version of the atomic theory. https://treehozz.com/what-was-platos-atomic-theory
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Robert Boyle claimed that everything was composed of small particles of a single universal matter. https://www.britannica.com/biography/Robert-Boyle -
Antoine Lavoisier discovered the Law of Conservation of Mass. https://atomictheorytimelineofscientists.weebly.com/antoine-lavoisier.html
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John Dalton proposed a theory very similar to the one today and Leucippus' theory. https://atomictheorytimelineofscientists.weebly.com/john-dalton.html -
Dmitri Mendeleev made a Periodic Table that organized the elements into a table according to their atomic weights. https://period1dmitrimendeleev.weebly.com/contribution-to-atomic-theory.html -
J. J. Thompson discovered electrons and deduced that they were smaller than the atoms themselves. https://atomictheorytimelineofscientists.weebly.com/j-j-thomson.html https://www.history.com/this-day-in-history/jj-thomson-announces-discovery-of-electrons -
Pierre and Marie Curie discovered Polonium and Radium. Marie Curie also stated that the arrangement of the atom doesn't make that the atom radioactive but the atom itself is radioactive. https://atomictheorytimelineofscientists.weebly.com/marie-curie.html https://easierwithpractice.com/how-did-marie-and-pierre-curie-contribute-to-the-atomic-theory/
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Albert Einstein discovered that atoms truly exist. He also showed that electrons can leave metals through the use of light. https://atomictheorytimelineofscientists.weebly.com/albert-einstein.html
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Robert Millikan discovered and figured out the electric charge on an electron. https://atomictheorytimelineofscientists.weebly.com/robert-millikan.html -
Ernest Rutherford discovered the existence of the nucleus and protons. https://atomictheorytimelineofscientists.weebly.com/ernest-rutherford.html -
Neils Bohr made the model of the hydrogen atom and discovered electrons. https://historyoftheatomictheory.wordpress.com/niels-bohrs-contributions-to-atomic-theory/
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Henry G. J. Mosely justified the chemical concept of the atomic number. https://treehozz.com/what-was-henry-moseley-contribution
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Erwin Schrodinger contributed to the atomic theory by making an equation that calculated the energy levels of an electron. https://atomictheorytimelineofscientists.weebly.com/erwin-schrodinger.html https://thehistoryoftheatoms.weebly.com/erwin-schrodinger.html#:~:text=Erwin%20Schrodinger%20-%20The%20History%20of%20the%20Atoms,finding%20of%20an%20electron%20in%20a%20certain%20position.
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James Chadwich discovered and confirmed the existence of neutrons. https://atomictheorytimelineofscientists.weebly.com/james-chadwick.html
