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Plato was a greek philosopher who discovered the four atomic types in the greek periodic table: earth, water, air, and fire. https://askinglot.com/what-is-contribution-of-plato -
Democritus was a greek philosopher who created the theory that the universe is made of infinite atoms. https://www.britannica.com/biography/Democritus https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/3.11/primary/lesson/democrituss-idea-of-the-atom-ms-ps/ -
Plato first proposed that the planets followed perfect circular orbits around the Earth. Later, Heraclides (330 B.C.) developed the first Solar System model. http://abyss.uoregon.edu/~js/ast221/lectures/lec06.html -
Antoine Lavoisier was a French chemist who founded the law of conservation of mass: atoms can neither be created or destroyed. https://www.nature.com/scitable/knowledge/library/the-conservation-of-mass-17395478/ -
The Alchemists laid down the foundation for the modern day periodic table. date is first know discussion about it https://prezi.com/t50cihtay12m/alchemy-and-its-contributions-to-the-atomic-theory/ -
John dalton was an English chemist who developed the atomic theory. https://www.britannica.com/biography/John-Dalton http://chemed.chem.purdue.edu/genchem/history/dalton.html -
The Billiard Ball model of the atom was proposed by John Dalton in 1803. https://www.cram.com/essay/The-Evolution-Of-Atoms-The-Billiard-Ball/FCUK5JMEMG -
Amedeo was an Italian scientist who assigned atomic weights to 17 metallic elements. https://www.britannica.com/biography/Amedeo-Avogadro -
Dmitri was a Russian chemist who arranged all the elements were arranged in size order of atomic weight, creating his version of the periodic table. https://www.britannica.com/biography/Dmitri-Mendeleev -
JJ Thomson was a British physicist who discovered the electron and proposed a model for the structure of the atom. https://www.sciencehistory.org/historical-profile/joseph-john-j-j-thomson -
Pierre and Marie Curie were polish chemists and physicists who created the term radioactive: spontaneous emission of ionizing penetrating rays by certain atoms. https://www.britannica.com/science/atom/Discovery-of-radioactivity -
the plum pudding model was first proposed by J.J. Thomson in 1904. https://www.electrical4u.com/thomsons-plum-pudding-model/ -
Albert Einstein was a German theoretical physicist who Mathematically proved the existence of atoms. https://www.ans.org/news/article-969/albert-einstein-and-the-most-elemental-atomic-theory/ -
Ernest Rutherford was a new Leland physicist who created the concept of the nuclear atom. https://www.britannica.com/biography/Ernest-Rutherford -
Robert Millikan was an American experimental physicist who precisely determined the magnitude of an electron's charge. https://www.nobelprize.org/prizes/physics/1923/millikan/facts/ -
Henry G. J. Moseley was an English physicist who discovered that the atomic number of an atom is the number of positive charges in the nucleus. https://www.britannica.com/biography/Henry-Moseley -
the quantum concept which restricts energy of a system to certain discreet values, too the problem of atomic and modular structure. https://www.britannica.com/biography/Niels-Bohr -
The Electron cloud model is a model of an atom, and was proposed by Erwin Schrodinger in 1926. https://www.universetoday.com/38282/electron-cloud-model/ -
Werner Heisenberg was a German theoretical chemist who made contributions to the theory of the atomic nucleus. https://www.britannica.com/biography/Werner-Heisenberg -
James Chadwick was a British physicist who discovered the neutron. https://www.atomicheritage.org/profile/james-chadwick -
Erwin Schrödinger was an Austrian-Irish physicist who discovered the new productive form of the atomic theory. https://www.atomicheritage.org/profile/james-chadwick