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500 BCE
The alchemists
The alchemists began examining the atomic theory about two centuries after the death of Aristotle. They used Aristotle’s idea about matter and began to create experiments and activities with them. By treating different metals and ores, the goal was to change the structure of the item so that it could become more valuable. -
400 BCE
Democritus
Democritus was an Ancient Greek pre-Socratic philosopher primarily remembered today for his formulation of an atomic theory of the universe. Also known for introducing the idea of the atom. -
330 BCE
Aristotle
was a Greek philosopher and polymath during the Classical period in Ancient Greece. Taught by Plato, he was the founder of the Lyceum, the Peripatetic school of philosophy, and the Aristotelian tradition. His writings cover many subjects including physics, biology, zoology, metaphysics, logic, ethics, aesthetics, poetry, theatre, music, rhetoric, psychology, linguistics, economics, politics, and government. -
427
Plato
Plato was an Athenian philosopher during the Classical period in Ancient Greece, founder of the Platonist school of thought, and the Academy, the first institution of higher learning in the Western world. -
Robert Boyle
Robert Boyle FRS was an Anglo-Irish natural philosopher, chemist, physicist, and inventor. Boyle is largely regarded today as the first modern chemist, and therefore one of the founders of modern chemistry, and one of the pioneers of modern experimental scientific method. He is best known for Boyle's law, which describes the inversely proportional relationship between the absolute pressure and volume of a gas, if the temperature is kept constant within a closed system. -
Lavoisier
Antoine Lavoisier after the French Revolution, was a French nobleman and chemist who was central to the 18th-century chemical revolution and who had a large influence on both the history of chemistry and the history of biology. He is widely considered in popular literature as the "father of modern chemistry". -
John dalton
was an English chemist, physicist, and meteorologist. He is best known for introducing the atomic theory into chemistry, and for his research into color blindness. He is also know for law of multiple properties and Daltons law. -
Billiard ball
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Dmitri Mendeleev
Marie Skłodowska Curie, born Maria Salomea Skłodowska, was a Polish and naturalized-French physicist and chemist who conducted pioneering research on radioactivity. -
The Curies
Marie Skłodowska Curie, born Maria Salome Skłodowska, was a Polish and naturalized-French physicist and chemist who conducted pioneering research on radioactivity. Also known for the discovery of radium and polonium. -
J.J Thomas
was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be discovered. Also known for the electron, isotope, sub atomic particle. -
Plum pudding
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Albert Einstein
Albert Einstein was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics. His work is also known for its influence on the philosophy of science. He is best known to the general public for his mass–energy equivalence formula E = mc², which has been dubbed "the world's most famous equation". -
Ernest Rutherford
Ernest was a New Zealand–born British physicist who came to be known as the father of nuclear physics. Encyclopedia Britannica considers him to be the greatest experimentalist since Michael Faraday. Also known for the proton, Rutherford model, radon, atomic nucleus, and the alpha and beta particle. -
Neil's Bohr
Neil's was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research. -
Robert Millikan
was an American experimental physicist honored with the Nobel Prize for Physics in 1923 for the measurement of the elementary electric charge and for his work on the photoelectric effect. -
Solar system model
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Henry G. J. Mosely
was an English physicist, whose contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number -
Electron Cloud Model
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Werner Heisenberg
Werner Heisenberg was a German theoretical physicist and one of the key pioneers of quantum mechanics. He published his work in 1925 in a breakthrough paper.
