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Democritus believed that If matter was divided into smaller and smaller pieces, it would eventually lead to the smallest piece possible that he referred to as the atomos which is the Greek word for atom.
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Aristotle believed that all matter was up of four elements earth, water, fire, and air.
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Sir Isaac Newton believed that atoms were pulled together by strong forces and attractions.
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Robert Boyle helped develop a definition for the atomic theory and also helped out with the 'death' of the four elements: fire, air, water, earth.
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Joseph Priestly discovered the gas named oxygen which has an atom number of 8.
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Antoine Lavoisier created the principle of conservation of mass.
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Dmitri Mendeleev created the periodic table of elements.
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John Dalton proposed numerous basic ideas regarding the atom as well as devising a number of element symbols.
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Ernest Rutherford revealed the atomic nucleus.
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James Chadwick developed the theory “Inside the nucleus contains neutral particles called neutrons as well as positively charged particles called electrons.”
