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Alchemy contributed to the atomic theory by laying the foundation of the modern day periodic table. https://www.britannica.com/science/chemistry/Alchemy
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Introduced the atomic theory in which the geometric forms serve as atoms.
http://abyss.uoregon.edu/~js/glossary/plato.html#:~:text=Plato%20was%20so%20impressed%20with%20this%20discovery%20that,Plato%20postulated%20that%20a%20fifth%20atomic%20type%20must -
Democritus adopted the atomic theory and developed it further. "Everything is made up of atoms which are physically invisible. He also created the first atomic model.
https://www.britannica.com/biography/Democritus -
He helped develop a definition of an element. He created the Boyle law which states that if volume of a gas is decreased, the pressure increases proportionally.
https://www.bbc.co.uk/history/historic_figures/boyle_robert.shtml -
Lavoisier found that mass is conserved in a chemical reaction. "Law of Conservation of mass."
https://philosophy-question.com/library/lecture/read/307569-what-are-the-contributions-of-antoine-lavoisier -
He was the 1st scientist to explain the behavior of atoms in terms of their measurement and weight. He also created the Billiard Ball model because he envisioned them as small hard spheres, so he used wooden balls to model them.
janetpanic.com/what-was-john-dalton-contribution-to-chemistry/ -
He was the most important contributor of the 1st periodic table of elements.
https://www.britannica.com/biography/Dmitri-Mendeleev -
They discovered that the atoms themselves were radioactive specifically polonium and radium which were strongly radioactive.
https://www.britannica.com/science/atom/Discovery-of-radioactivity -
He proposed a model called Plum Pudding model which played an important role of the research of an atomic structure.
https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/discovery-of-the-electron-and-nucleus -
He proved the atoms existence through Brownian motion and also created the atomic bomb.
https://www.ans.org/news/article-969/albert-einstein-and-the-most-elemental-atomic-theory/ -
Millikan was able to precisely calculate the magnitude of the electron's charge and also deduced the electric charge of an electron. https://www.nobelprize.org/prizes/physics/1923/millikan/biographical
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He changed the atomic model because of his gold foil experiment. He used alpha particles emitted by radioactive probes to the unseen world of the atomic structure.
https://www.britannica.com/biography/Ernest-Rutherford -
Bohr developed the Bohr model of the atom which introduced quantum mechanics, and also made the Solar system atomic model.
https://www.britannica.com/biography/Niels-Bohr -
He discovered the atomic number of each element using x-rays which led to a more accurate organization of the periodic table. www.britannica.com/science/Moseleys-law -
He made an equation that pinpointed were atoms were which helped in making very accurate models of atoms. He also created the electron cloud.
https://www.britannica.com/biography/Erwin-Schrodinger -
He discovered the neutrons in atoms and that they are located in the center of an atom.
https://www.britannica.com/biography/James-Chadwick
