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Plato stated that all matter is composed of particles called atoms
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Democritus said that everything is made up into tiny bits called atoms, Democritus also discovered that atoms are indestructible and unchangeable.
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Aristotle created a theory about there being elements, other than that Aristotle didnt really play any role
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Robert Boyle also known as "The father of Chemistry" discovered that atoms must exist based on the relationship between pressure.
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The alchemists developed the theory that all metals are composed of mercury and sulfur, they are discovered that it is possible to change.
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Lavoisier found that total mass of products and reactants in a chemical reaction is always the same. This led to the theory of the law of conservation of mass.
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Dalton was the first scientist to explain the behavior of atoms in terms of measurement and weight.
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Mendeleev published the periodic table of elements. It arranged the known elements according to their chemical properties.
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A pioneer in researching radioactivity, winning the nobel prize in physics in chemistry. The curries discovered radioactivity.
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Einstein was able to fully prove that atoms did exist. He also demonstrated that electrons could leave metal through usage of light.
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Millikan performed an oil drop experiment which measured electric charge. His hypothesis was to specify the size of the electrons charge.
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Rutherford discovered the atomic nucleus and received a nobel prize for study or radioactivity
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Neils Bohr created the solar system model. He discovered that the atom in the center has electrons orbiting it.
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Mosley observed and measured the spectra of 10 elements that occupied consecutive places in the periotic table.
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Heisenberg created a paper called the uncertainty paper which stated no object, no particle, or atom has a definite position.
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Thomson discovered the electron. A negatively charged part of of every atom. His experiments with positively charged partciles.